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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Affiliate Equity [Abstract]        
Net income (loss) (controlling interest) $ 71.3 $ 86.3 $ 86.3 $ (6.8)
(Decrease) increase in controlling interest paid-in capital from Affiliate equity issuances 2.9 (1.9) 1.6 (2.8)
Decrease in controlling interest paid-in capital from Affiliate equity repurchases (65.4) (7.6) (226.0) (38.2)
Net income (loss) (controlling interest) including the net impact of Affiliate equity transactions $ 8.8 $ 76.8 $ (138.1) $ (47.8)