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Consolidated Statement of Stockholders Equity (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Tax effect on net change in pension liability $ 0.2 $ 20.4 $ 1.4
Net change in fair value of derivative instruments, tax $ 1.1 $ 1.8 $ 0.7