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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | [1] | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated revenue | $ 564,400,000 | [1] | $ 601,300,000 | $ 600,200,000 | $ 612,500,000 | $ 604,100,000 | [2] | $ 585,700,000 | $ 570,900,000 | $ 544,300,000 | $ 2,378,400,000 | $ 2,305,000,000 | $ 2,194,600,000
Income before income taxes | (63,600,000) | [1] | 250,400,000 | 239,300,000 | 287,500,000 | 264,000,000 | [2] | 282,900,000 | 266,900,000 | 253,300,000 | 713,600,000 | 1,067,100,000 | 974,600,000
Net income | (98,800,000) | [1] | 201,900,000 | 205,200,000 | 224,000,000 | 393,800,000 | [2] | 216,800,000 | 204,400,000 | 193,700,000 | 532,300,000 | 1,008,700,000 | 739,000,000
Net income (controlling interest) | $ (151,300,000) | [1] | $ 124,900,000 | $ 117,000,000 | $ 153,000,000 | $ 315,400,000 | [2] | $ 125,400,000 | $ 126,300,000 | $ 122,500,000 | $ 243,600,000 | $ 689,500,000 | $ 472,800,000
Earnings per share (diluted) (in dollars per share) | $ (2.88) | [1] | $ 2.34 | $ 2.16 | $ 2.77 | $ 5.50 | [2] | $ 2.22 | $ 2.22 | $ 2.13 | $ 4.52 | $ 12.03 | $ 8.57
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments in Affiliates (net) | $ 2,791,000,000 |  |  |  |  | $ 3,304,700,000 |  |  |  |  | $ 2,791,000,000 | $ 3,304,700,000 |
Equity Method Investee |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments in Affiliates (net) | 2,791,000,000 |  |  |  |  | $ 3,304,700,000 |  |  |  |  | 2,791,000,000 | $ 3,304,700,000 | $ 3,368,300,000
Investment One | Equity Method Investee |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments in Affiliates (net) | $ 0 |  |  | $ 0 |  |  |  |  |  |  | $ 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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