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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 18.5 $ 17.1 $ 35.4 $ 35.1
Other comprehensive income/(loss):        
Changes in cumulative translation adjustment 1.0 (0.2) (0.2) (3.8)
Changes in unrealized gains/(losses) on derivative instruments, net of tax of $0.0, $0.0, $0.0 and $0.0, respectively 0 0 0 (0.1)
Amortization of prior service credit, net of tax of $0.0, $0.0, $0.1 and $0.1, respectively (0.3) (0.3) (0.6) (0.5)
Amortization of actuarial net losses, net of tax of $(0.3), $(0.3), $(0.6) and $(0.7), respectively 1.1 1.3 2.2 2.6
Total other comprehensive income/(loss) 1.8 0.8 1.4 (1.8)
Total comprehensive income $ 20.3 $ 17.9 $ 36.8 $ 33.3