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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
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Affiliate Equity [Abstract]    
Net income (loss) (controlling interest) $ 149.9 $ (15.6)
Decrease in controlling interest paid-in capital from Affiliate equity issuances (0.5) (1.3)
Decrease in controlling interest paid-in capital from Affiliate equity purchases (47.8) (155.1)
Net income (loss) (controlling interest) including the net impact of Affiliate equity transactions $ 101.6 $ (172.0)