Consolidated Statements of Comprehensive Income/(Loss) (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Comprehensive Income/(Loss) [Abstract]
Net income/(loss)	$ 15.5	$ (16.8)	$ 55.6	$ 29.3
Other comprehensive income/(loss):
Changes in cumulative translation adjustment	1.7	0.4	2.9	(3.1)
Changes in unrealized gains/(losses) on derivative instruments, net of tax of $0.0, $0.4, $0.1 and $0.4, respectively	0	(0.6)	(0.1)	(0.6)
Deferred income taxes	0	(2.6)	0	(2.6)
Amortization of prior service credit, net of tax	(0.3)	(0.2)	(0.7)	(0.7)
Amortization of actuarial net losses, net of tax of $0.0, $0.0, $(0.2) and $(0.1), respectively	0.3	0.1	0.7	0.2
Total other comprehensive income/(loss)	1.7	(2.9)	2.8	(6.8)
Total comprehensive income/(loss)	$ 17.2	$ (19.7)	$ 58.4	$ 22.5