Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 42.7	[1]	$ 41.6	[1]	$ 33.9	[1]
Other comprehensive (loss) income, net of tax:
Defined benefit plans adjustments	(2.9)		2.4		(2.9)
Foreign currency translation (loss) gain	(3.0)		(1.5)		0.4
Other comprehensive (loss) income, net of tax	(5.9)	[1]	0.9	[1]	(2.5)	[1]
Comprehensive income	$ 36.8		$ 42.5		$ 31.4

[1] Amounts have been rounded for presentation purposes and might differ from unrounded results.