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Redeemable Noncontrolling Interests - Table 2 (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Noncontrolling Interest [Abstract]                      
Net income attributable to nonredeemable noncontrolling interests                 $ 56.4 $ 55.9 $ 53.1
Net income attributable to redeemable noncontrolling interests                 14.1 13.8 6.6
Net income attributable to noncontrolling interests $ 16.8 $ 16.4 $ 18.6 $ 18.7 $ 18.8 $ 17.1 $ 17.3 $ 16.5 $ 70.5 $ 69.7 $ 59.7