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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 217.0 $ 112.6 $ 476.8 $ 368.0
Decrease in controlling interest paid-in capital from Affiliate equity issuances (4.5) (5.1) (13.1) (0.2)
(Decrease) increase in controlling interest paid-in capital from Affiliate equity purchases 1.9 (2.3) (36.1) (32.2)
Net income (controlling interest) including the net impact of Affiliate equity transactions $ 214.4 $ 105.2 $ 427.6 $ 335.6