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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net income $ 11.4 $ 35.6 $ 59.2 $ 88.0
Other comprehensive income/(loss):        
Changes in cumulative translation adjustment (0.1) 5.1 (0.3) 0.4
Amortization of prior service credit, net of tax of $0.0 million, $0.1 million, $0.1 million and $0.2 million, respectively (0.2) (0.2) (0.7) (0.7)
Amortization of actuarial net losses, net of tax of $(0.1) million, $(0.2) million, $(0.4) million and $(0.8) million, respectively 0.5 1.1 1.6 3.1
Total other comprehensive income 0.2 6.0 0.6 2.8
Total comprehensive income $ 11.6 $ 41.6 $ 59.8 $ 90.8