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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Affiliate Equity [Abstract]      
Net income (controlling interest) $ 1,145.9 $ 565.7 $ 202.2
(Decrease) increase in controlling interest paid-in capital from Affiliate equity issuances (0.2) (17.5) 1.1
Decrease in controlling interest paid-in capital from Affiliate equity purchases (38.2) (63.2) (239.1)
Net income (loss) (controlling interest) including the net impact of Affiliate equity transactions $ 1,107.5 $ 485.0 $ (35.8)