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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Affiliate Equity [Abstract]      
Net income (controlling interest) $ 511.6 $ 672.9 $ 1,145.9
Decrease in controlling interest paid-in capital from Affiliate equity issuances (3.1) (13.5) (0.2)
Decrease in controlling interest paid-in capital from Affiliate equity purchases (32.6) (50.4) (38.2)
Net income (controlling interest) including the net impact of Affiliate equity transactions $ 475.9 $ 609.0 $ 1,107.5