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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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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).

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