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Equity Method Investments in Affiliates - Financial Information for Affiliates Accounted for Under the Equity Method (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Net income $ 427.0 $ 305.1 $ 532.3
Assets 7,888.9 7,653.5  
Equity Method Investee      
Schedule of Equity Method Investments [Line Items]      
Revenues 2,659.7 2,760.9 3,231.7
Net income 1,061.8 1,061.3 $ 1,286.1
Assets 2,958.9 2,718.5  
Liabilities and Non-controlling interests $ 1,245.5 $ 1,212.7