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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 112.6 $ 128.4 $ 368.0 $ 387.3
Decrease in controlling interest paid-in capital from Affiliate equity issuances (5.1) 0.0 (0.2) (17.5)
Decrease in controlling interest paid-in capital from Affiliate equity purchases (2.3) (1.2) (32.2) (57.2)
Net income (controlling interest) including the net impact of Affiliate equity transactions $ 105.2 $ 127.2 $ 335.6 $ 312.6