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Basis of 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]      
Lease, right-of-use asset $ 240.6   $ 0.0
Operating lease liability $ 273.6    
ASU 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Lease, right-of-use asset   $ 246.0  
Operating lease liability   279.4  
Prepaid expense and other assets   9.1  
Accounts payable and accrued liabilities   $ 42.3