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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 84.3 $ 76.0 $ 156.6 $ 225.8
(Decrease) increase in controlling interest paid-in capital from Affiliate equity issuances (0.1) (0.8) 0.3 (2.6)
(Decrease) increase in controlling interest paid-in capital from Affiliate equity purchases 20.6 (15.2) 8.6 (22.4)
Net income (controlling interest) including the net impact of Affiliate equity transactions $ 104.8 $ 60.0 $ 165.5 $ 200.8