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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 14.0 $ 15.5 $ 49.1 $ 55.6
Other comprehensive income/(loss):        
Changes in cumulative translation adjustment 2.2 1.7 (1.6) 2.9
Changes in unrealized gains/(losses) on derivative instruments, net of tax of $0.0, $0.0, $0.0 and $0.1, respectively 0 0 (0.1) (0.1)
Amortization of prior service credit, net of tax of $0.1, $0.0, $0.2 and $0.2, respectively (0.2) (0.3) (0.7) (0.7)
Amortization of actuarial net losses, net of tax of $(0.3), $0.0, $(1.0) and $(0.2), respectively 1.4 0.3 4.0 0.7
Total other comprehensive income/(loss) 3.4 1.7 1.6 2.8
Total comprehensive income $ 17.4 $ 17.2 $ 50.7 $ 58.4