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Redeemable Noncontrolling Interests - Table 2 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Noncontrolling Interest [Abstract]        
Net income attributable to nonredeemable noncontrolling interests $ 13.8 $ 15.0 $ 28.3 $ 29.8
Net income attributable to redeemable noncontrolling interests 2.6 3.6 5.7 7.5
Net income attributable to noncontrolling interests $ 16.4 $ 18.6 $ 34.0 $ 37.3