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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 109.4 $ 109.0 $ 255.4 $ 258.9
(Decrease) increase in controlling interest paid-in capital from Affiliate equity issuances 1.5 (17.0) 4.9 (17.5)
Decrease in controlling interest paid-in capital from Affiliate equity purchases (4.0) (8.2) (29.9) (56.0)
Net income (controlling interest) including the net impact of Affiliate equity transactions $ 106.9 $ 83.8 $ 230.4 $ 185.4