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Redeemable Noncontrolling Interests - Table 2 (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
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
Noncontrolling Interest [Abstract]                      
Net income attributable to nonredeemable Noncontrolling Interest                 $ 61.2 $ 56.4 $ 55.9
Net income attributable to redeemable noncontrolling interest                 17.9 14.1 13.8
Net income attributable to noncontrolling interest $ 25.9 $ 19.2 $ 16.4 $ 17.6 $ 16.8 $ 16.4 $ 18.6 $ 18.7 $ 79.1 $ 70.5 $ 69.7