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Basis of Presentation (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease, liability $ 196.2    
Operating Lease, Right-of-Use Asset $ 193.8   $ 0.0
Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease, liability   $ 194.2  
Operating Lease, Right-of-Use Asset   $ 196.4