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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 76.0 $ 125.3 $ 225.8 $ 259.8
Decrease in controlling interest paid-in capital from Affiliate equity issuances (0.8) (5.0) (2.6) (8.6)
Decrease in controlling interest paid-in capital from Affiliate equity purchases (15.2) (10.5) (22.4) (38.0)
Net income (controlling interest) including the net impact of Affiliate equity transactions $ 60.0 $ 109.8 $ 200.8 $ 213.2