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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
Mar. 31, 2025
Mar. 31, 2024
Affiliate Equity [Abstract]    
Net income (controlling interest) $ 72.4 $ 149.8
(Decrease) increase in controlling interest paid-in capital from Affiliate equity issuances 0.4 (1.8)
Decrease in controlling interest paid-in capital from Affiliate equity purchases (12.0) (7.2)
Net income (controlling interest) including the net impact of Affiliate equity transactions $ 60.8 $ 140.8