Redeemable Noncontrolling Interests - Table 2 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Redeemable Noncontrolling Interest [Line Items]
Net income attributable to nonredeemable noncontrolling interest	$ 12.9	$ 12.6	$ 38.9	$ 38.4
Net income attributable to redeemable noncontrolling interest	1.8	1.5	5.4	4.1
Net income attributable to noncontrolling interests	$ 14.7	$ 14.1	$ 44.3	$ 42.5