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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 125.3 $ 109.4 $ 259.8 $ 255.4
Increase (decrease) in controlling interest paid-in capital from Affiliate equity issuances (5.0) 1.5 (8.6) 4.9
Decrease in controlling interest paid-in capital from Affiliate equity purchases (10.5) (4.0) (38.0) (29.9)
Net income (controlling interest) including the net impact of Affiliate equity transactions $ 109.8 $ 106.9 $ 213.2 $ 230.4