Noncontrolling Interests (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Noncontrolling interests
Balance at the beginning of period	$ 4.1	$ 3.1
Net income	1.3	0.3
Other	0.3
Balance at the end of period	$ 5.7	$ 3.4