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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net income $ 34.5 $ 18.5 $ 52.4 $ 35.4
Other comprehensive income/(loss):        
Changes in cumulative translation adjustment 3.3 1.0 (4.7) (0.2)
Amortization of prior service credit, net of tax of $0.0, $0.0, $0.1 and $0.1, respectively (0.3) (0.3) (0.5) (0.6)
Amortization of actuarial net losses, net of tax of $(0.3), $(0.3), $(0.6) and $(0.6), respectively 1.0 1.1 2.0 2.2
Total other comprehensive income/(loss) 4.0 1.8 (3.2) 1.4
Total comprehensive income $ 38.5 $ 20.3 $ 49.2 $ 36.8