Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net Income	$ 23.7	$ 38.0	$ 21.8	$ 25.2	$ 54.4	$ 25.7	$ 19.2	$ 62.8	$ 108.7	$ 162.1	$ 79.5
Other comprehensive income (loss)
Foreign currency translation adjustment									0.4	(14.9)	(6.7)
Current period cash flow hedging activity, net of $2.4 tax expense in 2012, $0.2 tax expense in 2011 and $3.3 tax benefit in 2010									7.7	2.4	(3.7)
Reclassification of hedging activities into earnings, net of $2.7 tax expense in 2012, $2.6 tax expense in 2011 and $4.2 tax expense in 2010									(2.8)	9.2	(8.8)
Current period pension and postretirement plan adjustment, net of $1.6 tax benefit in 2012, $7.3 tax benefit in 2011, and $1.6 tax benefit in 2010									(1.7)	(19.0)	(3.8)
Reclassification of pension and postretirement adjustments into earnings, net of $2.0 tax expense in 2012, $1.8 tax expense in 2011 and $1.3 tax expense in 2010									5.9	6.7	5.1
Comprehensive Income									$ 118.2	$ 146.5	$ 61.6