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Earnings Per Share - Reconciliation of the Numerator and Denominator used in the Calculation of Basic and Diluted Earnings per Share (Details) - USD ($)
shares in Millions, $ 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
Numerator                      
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
Interest expense on junior convertible securities, net of taxes                 0.0 0.0 15.5
Net income (controlling interest), as adjusted                 $ 15.7 $ 243.6 $ 705.0
Denominator                      
Average shares outstanding (basic) (in shares)                 50.5 53.6 56.0
Effect of dilutive instruments:                      
Stock options and restricted stock units (in shares)                 0.1 0.2 0.4
Convertible securities (in shares)                 0.0 0.0 2.2
Average shares outstanding (diluted) (in shares)                 50.6 53.8 58.6
[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.