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Interim Financial Statements (Recent Accounting Pronouncements) (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 Liabilities $ 356.1    
Operating Lease Assets $ 343.4   $ 0.0
Accounting Standards Update 2016-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating Lease Liabilities   $ 358.1  
Operating Lease Assets   $ 344.6