Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Tax on gain/loss on derivatives	$ (1.8)	$ 0.9	$ 14.6
Tax on translation adjustments	1.7	1.5	1.0
Tax on postretirement and postemployment benefits	(0.8)	12.2	0
Accumulated Other Comprehensive Income/(Loss)
Tax on gain/loss on derivatives	(1.8)	0.9	14.6
Tax on translation adjustments	1.7	1.5	1.0
Tax on postretirement and postemployment benefits	$ (0.8)	$ 12.2	$ 0