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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).