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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
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Dec. 31, 2018 | [1] | Sep. 30, 2018 | [1] | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | [2] | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Numerator |  |  |  |  |  |  |  |  |  |  |
Net income (controlling interest) | $ (151.3) | $ 124.9 | $ 117.0 | $ 153.0 | $ 315.4 | $ 125.4 | $ 126.3 | $ 122.5 | $ 243.6 | $ 689.5 | $ 472.8
Interest expense on convertible securities, net of taxes |  |  |  |  |  |  |  |  | 0.0 | 15.5 | 15.5
Net income (controlling interest), as adjusted |  |  |  |  |  |  |  |  | $ 243.6 | $ 705.0 | $ 488.3
Denominator |  |  |  |  |  |  |  |  |  |  |
Average shares outstanding (basic) (in shares) |  |  |  |  |  |  |  |  | 53.6 | 56.0 | 54.2
Effect of dilutive instruments: |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock units (in shares) |  |  |  |  |  |  |  |  | 0.2 | 0.4 | 0.6
Convertible securities (in shares) |  |  |  |  |  |  |  |  | 0.0 | 2.2 | 2.2
Average shares outstanding (diluted) (in shares) |  |  |  |  |  |  |  |  | 53.8 | 58.6 | 57.0
[1] | For the year ended December 31, 2018, the Company recorded expenses to reduce the carrying value of the U.S. alternative Affiliate to zero and one of its non-U.S. alternative Affiliates accounted for under the equity method to fair value (see Note 13 for additional information).
[2] | In the fourth quarter of 2017, the Company recorded a one-time net benefit from changes in U.S. tax laws (see Note 22 for additional information) and an expense to reduce the carrying value of one of its U.S. alternative Affiliates accounted for under the equity method (see Note 13 for additional information).

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