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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
segment
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Operating lease assets $ 447.8   $ 0.0
Operating lease liabilities $ 508.6    
Number of reportable segments | segment 1    
Interest in subsidiary (less than given percentage) 100.00%    
Accounting Standards Update 2016-02      
Operating lease assets   $ 463.0  
Operating lease liabilities   $ 526.0