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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
 [1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 604.1 $ 585.7 $ 570.9 $ 544.3 $ 550.3 $ 544.7 $ 554.1 $ 545.4 $ 2,305.0 $ 2,194.6 $ 2,484.5
Operating income 280.0 289.5 275.9 262.5 301.9 238.5 247.0 246.8 1,107.9 1,034.1 1,123.9
Income before income taxes 264.0 282.9 266.9 253.3 281.9 226.2 235.9 230.5 1,067.1 974.6 1,090.6
Net income (controlling interest) $ 315.4 $ 125.4 $ 126.3 $ 122.5 $ 150.2 $ 110.2 $ 108.3 $ 104.0 $ 689.5 $ 472.8 $ 509.5
Earnings per share - diluted (in dollars per share) $ 5.50 $ 2.22 $ 2.22 $ 2.13 $ 2.67 $ 2.02 $ 1.98 $ 1.90 $ 12.03 $ 8.57 $ 9.17
[1] In the fourth quarter of 2017, the Company recorded a provisional one-time net benefit from changes in U.S tax laws (see Note 22) and an expense associated with the impairment of one of its Affiliates accounted for under the equity method (see Note 13).