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Consolidated Statements Of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Consolidated Statements Of Comprehensive Income [Abstract]    
Net income $ 24.6 $ 21.5
Other comprehensive income:    
Changes in cumulative translation adjustment 0.2 0.5
Changes in unrealized gains/(losses) on derivative instruments, net of tax of $0.1 and $0.0, respectively (0.1) 0.2
Amortization of actuarial net losses, net of tax of $(0.1) and $0.0, respectively 0.2 0.1
Amortization of prior service credit, net of tax of $0.1 and $0.1, respectively (0.2) (0.2)
Total other comprehensive income 0.1 0.6
Total comprehensive income $ 24.7 $ 22.1