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Fair Value Of Assets And Liabilities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity method investments $ 481.9   $ 481.9   $ 426.1
Other investments 10.1   10.1   $ 10.5
Total Return Swap | Designated as Hedging Instrument          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative notional amount 368.6   368.6    
Market valuation gain (loss) recognized $ 16.8 $ 30.1 $ 26.0 $ (1.3)