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Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Consolidated Statements Of Comprehensive Income [Abstract]    
Changes in unrealized gains/(losses) on derivative instruments, tax $ 0.1 $ 0
Amortization of actuarial net losses, tax (0.1) 0
Amortization of prior service credit, tax $ 0.1 $ 0.1