Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details 5)

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Summary of Significant Accounting Policies (Details 5) - USD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred non-incremental lease cost   $ 1.2 $ 1.1
Operating Lease, Right-of-use Assets | Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Effect of new accounting principle $ 11.0    
Operating Lease, Right-of-use Assets | Property | Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Effect of new accounting principle 16.0    
Finance Lease, Right-of Use Assets | Property | Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Effect of new accounting principle 38.0    
Lease Liability | Property | Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Effect of new accounting principle 16.0    
Total Properties, Net | Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Effect of new accounting principle $ (38.0)