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Affiliate Equity - Effect of Changes in the Company's Ownership Interest in its Affiliates on the Controlling Interest's Equity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Affiliate Equity [Abstract]      
Net income (controlling interest) $ 202.2 $ 15.7 $ 243.6
(Decrease) increase in controlling interest paid-in capital from Affiliate equity issuances 1.1 (3.1) (5.0)
Decrease in controlling interest paid-in capital from Affiliate equity repurchases (239.1) (50.8) (67.9)
Net income (loss) (controlling interest) including the net impact of Affiliate equity transactions $ (35.8) $ (38.2) $ 170.7