Redeemable Noncontrolling Interests - Table 2 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Redeemable Noncontrolling Interest [Line Items]
Net income attributable to nonredeemable noncontrolling interest	$ 15.0	$ 13.8	$ 29.8	$ 27.4
Net income attributable to redeemable noncontrolling interest	3.6	3.5	7.5	6.4
Net income attributable to noncontrolling interests	$ 18.6	$ 17.3	$ 37.3	$ 33.8