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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 123.6 $ 217.0 $ 349.5 $ 476.8
Decrease in controlling interest paid-in capital from Affiliate equity issuances 0.0 (4.5) (2.6) (13.1)
Increase (decrease) in controlling interest paid-in capital from Affiliate equity purchases (0.5) 1.9 (22.9) (36.1)
Net income (controlling interest) including the net impact of Affiliate equity transactions $ 123.1 $ 214.4 $ 324.0 $ 427.6