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Consolidated Statements of Stockholders' Equity (USD $) In Millions | Total | Bachman [Member] | Chemsil [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Additional Paid-In Capital [Member] Bachman [Member] | Additional Paid-In Capital [Member] Chemsil [Member] | Treasury Stock [Member] | Treasury Stock [Member] Bachman [Member] | Treasury Stock [Member] Chemsil [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2010 |  | $ 300.7 |  |  |  | $ 0.3 | $ 286.3 |  |  | $ (64.8) |  |  | $ 210.5 | $ (131.6)
Revision of prior period (Note 2) |  | 0 |  |  |  |  |  |  |  |  |  |  | (16.1) | 16.1
Revised beginning balance |  | 300.7 |  |  |  | 0.3 | 286.3 |  |  | (64.8) |  |  | 194.4 | (115.5)
Net income |  | 47.1 |  |  |  |  |  |  |  |  |  |  | 47.1 |
Changes in cumulative translation adjustment |  | (3.9) |  |  |  |  |  |  |  |  |  |  |  | (3.9)
Changes in unrealized gains/(losses) on derivative instruments, net of tax |  | (0.7) |  |  |  |  |  |  |  |  |  |  |  | (0.7)
Treasury stock re-issued |  | 5.7 |  |  |  |  | 0.9 |  |  | 4.8 |  |  |  |
Treasury stock repurchased |  | (28.1) |  |  |  |  |  |  |  | (28.1) |  |  |  |
Stock option compensation |  | 4.3 |  |  |  |  | 4.3 |  |  |  |  |  |  |
Deferred taxes | [1] | (2.6) | [2] |  |  |  |  |  |  |  |  |  |  | (2.6)
Amortization of prior service credit, net of tax |  | (0.9) |  |  |  |  |  |  |  |  |  |  |  | (0.9)
Amortization of actuarial net losses, net of tax |  | 2.0 |  |  |  |  |  |  |  |  |  |  |  | 2.0
Actuarial net gains (losses) arising during the year, net of tax |  | 19.5 |  |  |  |  |  |  |  |  |  |  |  | 19.5
Ending Balance at Dec. 31, 2011 |  | 343.1 |  |  |  | 0.3 | 291.5 |  |  | (88.1) |  |  | 241.5 | (102.1)
Net income |  | 66.9 |  |  |  |  |  |  |  |  |  |  | 66.9 |
Dividend paid |  | (46.7) |  |  |  |  |  |  |  |  |  |  | (46.7) |
Changes in cumulative translation adjustment |  | 7.2 |  |  |  |  |  |  |  |  |  |  |  | 7.2
Changes in unrealized gains/(losses) on derivative instruments, net of tax |  | (0.1) |  |  |  |  |  |  |  |  |  |  |  | (0.1)
Treasury stock re-issued |  | 1.0 |  |  |  |  | (3.5) |  |  | 4.5 |  |  |  |
Treasury stock repurchased |  | (1.4) |  |  |  |  |  |  |  | (1.4) |  |  |  |
Stock option compensation |  | 2.1 |  |  |  |  | 2.1 |  |  |  |  |  |  |
Deferred taxes | [2] | 0 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of Strata acquisition-related contingently issuable shares |  | 2.0 |  |  |  |  | 2.0 |  |  |  |  |  |  |
Amortization of prior service credit, net of tax |  | (1.0) |  |  |  |  |  |  |  |  |  |  |  | (1.0)
Amortization of actuarial net losses, net of tax |  | 2.4 |  |  |  |  |  |  |  |  |  |  |  | 2.4
Actuarial net gains (losses) arising during the year, net of tax |  | (58.5) |  |  |  |  |  |  |  |  |  |  |  | (58.5)
Ending Balance at Dec. 31, 2012 |  | 317.0 |  |  |  | 0.3 | 292.1 |  |  | (85.0) |  |  | 261.7 | (152.1)
Net income |  | 77.8 |  |  |  |  |  |  |  |  |  |  | 77.8 |
Dividend paid |  | (12.0) |  |  |  |  |  |  |  |  |  |  | (12.0) |
Changes in cumulative translation adjustment |  | 1.2 |  |  |  |  |  |  |  |  |  |  |  | 1.2
Changes in unrealized gains/(losses) on derivative instruments, net of tax |  | (0.1) |  |  |  |  |  |  |  |  |  |  |  | (0.1)
Treasury stock re-issued |  | 4.6 |  |  |  |  | (4.2) |  |  | 8.8 |  |  |  |
Treasury stock repurchased |  | (3.7) |  |  |  |  |  |  |  | (3.7) |  |  |  |
Excess tax benefit from stock based payment arrangements |  | 3.8 |  |  |  |  | 3.8 |  |  |  |  |  |  |
Stock option compensation |  | 2.5 |  |  |  |  | 2.5 |  |  |  |  |  |  |
Deferred taxes | [2] | 0 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of acquisition-related consideration |  |  |  | 15.0 | 6.2 |  |  | 10.5 | 4.1 |  | 4.5 | 2.1 |  |
Amortization of prior service credit, net of tax |  | (1.0) |  |  |  |  |  |  |  |  |  |  |  | (1.0)
Amortization of actuarial net losses, net of tax |  | 4.8 |  |  |  |  |  |  |  |  |  |  |  | 4.8
Actuarial net gains (losses) arising during the year, net of tax |  | (6.7) |  |  |  |  |  |  |  |  |  |  |  | (6.7)
Ending Balance at Dec. 31, 2013 |  | $ 409.4 |  |  |  | $ 0.3 | $ 308.8 |  |  | $ (73.3) |  |  | $ 327.5 | $ (153.9)
[1] | Impact on deferred taxes of a change in the associated tax rate on the unrecognized actuarial net losses.
[2] | 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.

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