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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 128.4 $ 71.3 $ 387.3 $ 86.3
Increase (decrease) in controlling interest paid-in capital from Affiliate equity issuances 0.0 2.9 (17.5) 1.6
Decrease in controlling interest paid-in capital from Affiliate equity purchases (1.2) (65.4) (57.2) (226.0)
Net income (loss) (controlling interest) including the net impact of Affiliate equity transactions $ 127.2 $ 8.8 $ 312.6 $ (138.1)