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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 109.0 $ 30.7 $ 258.9 $ 15.1
Decrease in controlling interest paid-in capital from Affiliate equity issuances (17.0) 0.0 (17.5) (1.3)
Decrease in controlling interest paid-in capital from Affiliate equity purchases (8.2) (5.5) (56.0) (160.6)
Net income (loss) (controlling interest) including the net impact of Affiliate equity transactions $ 83.8 $ 25.2 $ 185.4 $ (146.8)