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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net income $ 28.9 $ 34.5 $ 47.8 $ 52.4
Other comprehensive income/(loss):        
Changes in cumulative translation adjustment (1.8) 3.3 (0.2) (4.7)
Amortization of prior service credit, net of tax of $0.0 million, $0.0 million, $0.1 million and $0.1 million, respectively (0.3) (0.3) (0.5) (0.5)
Amortization of actuarial net losses, net of tax of $(0.1) million, $(0.3) million, $(0.3)million and $(0.6) million, respectively 0.6 1.0 1.1 2.0
Total other comprehensive income (1.5) 4.0 0.4 (3.2)
Total comprehensive income $ 27.4 $ 38.5 $ 48.2 $ 49.2