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Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |  |  |
Net income | $ 77.8 |  | $ 66.9 |  | $ 47.1 |
Changes in cumulative translation adjustment | 1.2 |  | 7.2 |  | (3.9) |
Changes in unrealized gains/(losses) on derivative instruments, net of tax of $0.0 million, $0.0 million and $0.3 million, respectively | (0.1) |  | (0.1) |  | (0.7) |
Deferred taxes | 0 | [1] | 0 | [1] | (2.6) | [1],[2]
Amortization of prior service credit, net of tax of $0.3 million, $0.3 million and $0.4 million, respectively | (1.0) |  | (1.0) |  | (0.9) |
Amortization of actuarial net losses, net of tax of $(1.4) million, $(0.8) million and $(0.7) million, respectively | 4.8 |  | 2.4 |  | 2.0 |
Actuarial net (losses)/gains arising during the year, net of tax of $1.8 million, $17.8 million and $(6.6) million, respectively | (6.7) |  | (58.5) |  | 19.5 |
Total comprehensive income | $ 76.0 |  | $ 16.9 |  | $ 60.5 |
[1] | Impact on deferred taxes during the year ended December 31, 2011 of a change in the associated tax rate on the unrecognized actuarial net losses.
[2] | Impact on deferred taxes of a change in the associated tax rate on the unrecognized actuarial net losses.

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