Noncontrolling Interests (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
Noncontrolling interests
Balance at the beginning of period	$ 5.1	$ 3.8	$ 4.1	$ 3.1
Net income	0.8	0.3	2.5	1.0
Cash payments to noncontrolling interests		(0.6)	(1.1)	(0.6)
Other	(0.3)		0.1
Balance at the end of period	$ 5.6	$ 3.5	$ 5.6	$ 3.5