Annual report pursuant to Section 13 and 15(d)

Debt, Net (Narrative) (Details)

v3.20.4
Debt, Net (Narrative) (Details)
12 Months Ended
Sep. 17, 2020
USD ($)
Oct. 10, 2018
USD ($)
extension
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Oct. 19, 2020
USD ($)
Debt Instrument [Line Items]            
Loss on early extinguishment of debt     $ (7,306,000) $ 0 $ (258,000)  
Revolving Credit Facility            
Debt Instrument [Line Items]            
Weighted average interest rate     1.20%      
Aggregate additional borrowing capacity     $ 500,000,000.0      
Term Loan Facility            
Debt Instrument [Line Items]            
Loan increase     $ 150,000,000.0      
Repayments of term loan         $ 100,000,000.0  
Minimum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Variable rate, spread     0.775%      
Minimum | Term Loan Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Variable rate, spread     1.00%      
Maximum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Variable rate, spread     1.45%      
Maximum | Term Loan Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Variable rate, spread     1.65%      
Revolving Credit Facility | Revolving Credit Facility            
Debt Instrument [Line Items]            
Weighted average borrowings     $ 204,900,000 $ 255,600,000    
Weighted average interest rate     1.55% 3.32%    
Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Current borrowing capacity   $ 800,000,000.0 $ 800,000,000.0      
Maximum availability   $ 1,250,000,000        
Number of extensions | extension   2        
Extension option period   6 months 6 months      
Line of credit facility, extension fee   0.075%        
Remaining borrowing capacity     $ 657,000,000.0      
Line of Credit | Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Variable rate, spread   0.775%        
Commitment fee percentage   0.125%        
Line of Credit | Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Variable rate, spread   1.45%        
Commitment fee percentage   0.30%        
Senior Notes            
Debt Instrument [Line Items]            
Redemption period before maturity date for 100% redemption price     3 months      
Redemption price     100.00%      
Senior Notes | 2.25% Senior Notes            
Debt Instrument [Line Items]            
Loan amount $ 400,000,000.0   $ 400,000,000      
Initial offering price 99.416%          
Proceeds from issuance of debt $ 395,300,000          
Effective interest rate on debt     2.48%      
Basis point used in determining redemption price prior to maturity 0.35%          
Redemption period before maturity date for 100% redemption price     1 month      
Senior Notes | 3.70% Senior Notes            
Debt Instrument [Line Items]            
Loan amount       $ 300,000,000    
Effective interest rate on debt       3.85%    
Repurchased face amount $ 122,900,000         $ 177,100,000
Repurchase face amount including accrued interest $ 126,000,000.0         $ 180,900,000
Loss on early extinguishment of debt     $ 7,300,000      
Senior Notes | 3.60% Senior Notes            
Debt Instrument [Line Items]            
Loan amount     $ 350,000,000      
Effective interest rate on debt     3.70%      
Senior Notes | 3.60% Senior Notes | Adjusted Treasury            
Debt Instrument [Line Items]            
Basis point used in determining redemption price prior to maturity     0.30%      
Senior Notes | 5.250% Senior Notes            
Debt Instrument [Line Items]            
Loan amount     $ 250,000,000      
Effective interest rate on debt     5.49%      
Senior Notes | 5.250% Senior Notes | Adjusted Treasury            
Debt Instrument [Line Items]            
Basis point used in determining redemption price prior to maturity     0.40%      
Senior Notes | 5.0% Senior Notes            
Debt Instrument [Line Items]            
Loan amount     $ 300,000,000      
Effective interest rate on debt     5.15%      
Senior Notes | 5.0% Senior Notes | Adjusted Treasury            
Debt Instrument [Line Items]            
Basis point used in determining redemption price prior to maturity     0.45%