Fair Value Unobservable Inputs (Details) (Mandatorily redeemable noncontrolling interests, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Mandatorily redeemable noncontrolling interests
Fair value assets and liabilities measured on recurring basis unobservable input reconciliation
Balance at beginning of period, mandatorily redeemable noncontrolling interests	$ 27.0	$ 25.3
Level 3 additions	5.6	0.2
Level 3 reductions	(0.8)	0
Realized losses included in net income	1.0	1.5
Foreign currency translation	0	0
Balance at end of period, mandatorily redeemable noncontrolling interests	$ 32.8	$ 27.0