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Affiliate Equity - Effect of Changes in the Company's Ownership Interest in its Affiliates on the Controlling Interest's Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
 [1]
Sep. 30, 2019
 [1]
Jun. 30, 2019
Mar. 31, 2019
 [1]
Dec. 31, 2018
 [2]
Sep. 30, 2018
Jun. 30, 2018
 [2]
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Affiliate Equity [Abstract]                      
Net income (controlling interest) $ 22.5 $ 86.3 $ 107.7 $ (200.8) $ (151.3) $ 124.9 $ 117.0 $ 153.0 $ 15.7 $ 243.6 $ 689.5
Decrease in controlling interest paid-in capital from Affiliate equity issuances                 (3.1) (5.0) (1.0)
Decrease in controlling interest paid-in capital from Affiliate equity repurchases                 (50.8) (67.9) (116.2)
Net income (loss) (controlling interest) including the net impact of Affiliate equity transactions                 $ (38.2) $ 170.7 $ 572.3
[1] In the first, third and fourth quarters of 2019, the Company recorded $415.0 million, $10.0 million and $60.0 million of expenses, respectively, to reduce the carrying value to fair value of certain of its Affiliates. In the fourth quarter of 2019, the Company recorded $35.0 million of expenses to reduce the carrying value to fair value of certain of its indefinite-lived
[2]
In the second and fourth quarter of 2018, the Company recorded $33.3 million and $240.0 million of expenses, respectively, to reduce the carrying value to fair value of certain of its Affiliates.