Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 11.7	$ 10.1	$ 14.3	$ 13.7
Other comprehensive income (loss), net of tax:
Minimum pension liability adjustment	0.1	0	0.2	0.1
Foreign currency translation adjustment losses	(0.8)	(0.3)	(1.3)	0
Total other comprehensive (loss) income, net of tax	(0.7)	(0.3)	(1.1)	0.1
Comprehensive income	$ 11.0	$ 9.8	$ 13.2	$ 13.8