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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, 2024
Mar. 31, 2023
Affiliate Equity [Abstract]    
Net income (controlling interest) $ 149.8 $ 134.5
Decrease in controlling interest paid-in capital from Affiliate equity issuances (1.8) (3.6)
Decrease in controlling interest paid-in capital from Affiliate equity purchases (7.2) (27.5)
Net income (controlling interest) including the net impact of Affiliate equity transactions $ 140.8 $ 103.4