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Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Consolidated Statements Of Comprehensive Income [Abstract]    
Changes in unrealized (losses)/gains on derivative instruments, tax$ 0.4$ (0.4)$ 0.4$ 0.1
Amortization of actuarial net losses, tax0(0.4)(0.1)(1.0)
Gain on pension plan amendment, tax000(4.8)
Amortization of prior service credit, tax$ 0.1$ 0.1$ 0.3$ 0.2