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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]      
Net income $ 119.5 $ 84.1 $ 77.8
Changes in cumulative translation adjustment (11.0) (18.0) 1.2
Changes in unrealized losses on derivative instruments, net of tax of $0.0 million, $0.0 million and $0.0 million, respectively 0.0 0.0 (0.1)
Amortization of prior service credit, net of tax of $0.2 million, $0.3 million and $0.3 million, respectively (1.0) (1.0) (1.0)
Amortization of actuarial net losses, net of tax of $(1.0) million, $(1.1) million and $(1.4) million, respectively 4.2 4.3 4.8
Actuarial net gains/(losses) arising during the year, net of tax of $(0.9) million, $(13.9) million and $1.8 million, respectively 3.2 54.7 (6.7)
Total comprehensive income $ 114.9 $ 124.1 $ 76.0