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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total assets   $ 12,914.2 $ 12,280.6 $ 9,973.0
Total liabilities   $ 10,077.9 $ 9,331.6  
Accounting Standards Update 2016-02 | Scenario, Forecast | Minimum        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total assets $ 200.0      
Total liabilities 270.0      
Accounting Standards Update 2016-02 | Scenario, Forecast | Maximum        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total assets 250.0      
Total liabilities $ 320.0