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Affiliate Equity - Changes in the Company's Interest in its Affiliates on the Controlling Interest's Equity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Affiliate Equity [Abstract]      
Net income (controlling interest) $ 565.7 $ 202.2 $ 15.7
(Decrease) increase in controlling interest paid-in capital from Affiliate equity issuances (17.5) 1.1 (3.1)
Decrease in controlling interest paid-in capital from Affiliate equity purchases (63.2) (239.1) (50.8)
Net income (loss) (controlling interest) including the net impact of Affiliate equity transactions $ 485.0 $ (35.8) $ (38.2)