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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Affiliate Equity [Abstract]        
Net income (loss) (controlling interest) $ 30.7 $ 107.7 $ 15.1 $ (93.1)
Decrease in controlling interest paid-in capital from Affiliate equity issuances 0.0 (0.2) (1.3) (0.9)
Decrease in controlling interest paid-in capital from Affiliate equity repurchases (5.5) (13.3) (160.6) (30.6)
Net income (loss) (controlling interest) including the net impact of Affiliate equity transactions $ 25.2 $ 94.2 $ (146.8) $ (124.6)