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Consolidated Statement of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 17.1 $ 15.5 $ 35.1 $ 40.1
Other comprehensive income/(loss):        
Changes in cumulative translation adjustment (0.2) 1.0 (3.8) 1.2
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 $0.0, $0.1, $0.1 and $0.2, respectively (0.3) (0.2) (0.5) (0.4)
Amortization of actuarial net losses, net of tax of $(0.3), $(0.1), $(0.7) and $(0.2), respectively 1.3 0.2 2.6 0.4
Total other comprehensive income/(loss) 0.8 1.0 (1.8) 1.1
Total comprehensive income $ 17.9 $ 16.5 $ 33.3 $ 41.2