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Description of the Business and Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease right-of-use asset $ 430.4  
Operating lease, liability $ 515.6  
Accounting Standards Update 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease right-of-use asset   $ 431.7
Operating lease, liability   $ 502.4