Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 35.6	$ 20.8	$ 88.0	$ 56.2
Other comprehensive income/(loss):
Changes in cumulative translation adjustment	5.1	(6.0)	0.4	(6.2)
Amortization of prior service credit, net of tax of $0.1, $0.1, $0.2 and $0.2, respectively	(0.2)	(0.2)	(0.7)	(0.8)
Amortization of actuarial net losses, net of tax of $(0.2), $(0.2), $(0.8) and $(0.8), respectively	1.1	1.1	3.1	3.3
Total other comprehensive income	6.0	(5.1)	2.8	(3.7)
Total comprehensive income	$ 41.6	$ 15.7	$ 90.8	$ 52.5