Noncontrolling Interests (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Noncontrolling interests
Balance at the beginning of period	$ 5.7	$ 3.4	$ 4.1	$ 3.1
Net income	0.4	0.4	1.7	0.7
Cash payments to noncontrolling interests	(1.1)		(1.1)
Other	0.1		0.4
Balance at the end of period	$ 5.1	$ 3.8	$ 5.1	$ 3.8