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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
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
Numerator                      
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
Interest expense on convertible securities, net of taxes                 15.5 15.5 15.3
Net income (controlling interest), as adjusted                 $ 705.0 $ 488.3 $ 524.8
Denominator                      
Average shares outstanding - basic (in shares)                 56.0 54.2 54.3
Effect of dilutive instruments:                      
Stock options and restricted stock units (in shares)                 0.4 0.6 0.7
Junior convertible securities (in shares)                 2.2 2.2 2.2
Average shares outstanding - diluted (in shares)                 58.6 57.0 57.2
[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).