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Shareholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended |  | 0 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 22, 2014 | Apr. 22, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Mar. 31, 2013 | Nov. 04, 2014 Subsequent Event [Member] | Oct. 21, 2014 Subsequent Event [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 0.03 | $ 0.03 | $ 0.03 |  | $ 0.00 |  | $ 0.06 |  | $ 0.00 |  |  |  | $ 0.03
Stock Repurchase Program, Authorized Amount |  | $ 15.0 |  |  |  |  |  |  |  |  |  | $ 75.0 |
Treasury Stock, Shares, Acquired |  |  | 230,150 | 232,475 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, Pension Benefit Plan Costs |  |  |  | (56.7) |  |  | (58.1) |  | (91.0) |  | (85.6) |  |
Other comprehensive income (expense) before reclassifications, Pension Benefit Plan Costs |  |  | 0.6 |  | (4.1) |  | 0.3 |  | (2.7) |  |  |  |
Amounts reclassified from accumulated other comprehensive income, Pension Benefit Plan Costs |  |  | 0.8 |  | 2.9 | [1] | 2.5 | [2] | 6.9 | [1] |  |  |
Net current-period other comprehensive income (expense, Pension Benefit Plan Costs |  |  | 1.4 |  | (1.2) |  | 2.8 |  | 4.2 |  |  |  |
Ending balance, Pension Benefit Plan Costs |  |  | (55.3) |  | (86.8) |  | (55.3) |  | (86.8) |  | (85.6) |  |
Beginning balance, Foreign Currency |  |  |  | 16.4 |  |  | 16.0 |  | 10.8 |  | 6.3 |  |
Other comprehensive income (expense) before reclassifications, Foreign Currency |  |  | (9.6) |  | 6.3 |  | (9.4) |  | 2.1 |  |  |  |
Amounts reclassified from accumulated other comprehensive income, Foreign Currency |  |  | (0.1) |  | 0.2 | [1] | 0.1 | [2] | (0.1) | [1] |  |  |
Net current-period other comprehensive income (expense, Foreign Currency |  |  | (9.7) |  | 6.5 |  | (9.3) |  | 2.0 |  |  |  |
Ending balance, Foreign Currency |  |  | 6.7 |  | 12.8 |  | 6.7 |  | 12.8 |  | 6.3 |  |
Beginning balance, Unrealized Gain (Loss) on Derivatives |  |  |  | 0 |  |  | 0.2 |  | 0.1 |  | 0.6 |  |
Other comprehensive income (expense) before reclassifications, Unrealized Gain (Loss) on Derivatives |  |  | 0.2 |  | (0.4) |  | 0 |  | 0.1 |  |  |  |
Amounts reclassified from accumulated other comprehensive income, Unrealized Gain (Loss) on Derivatives |  |  | 0 |  | 0 | [1] | 0 | [2] | 0 | [1] |  |  |
Net current-period other comprehensive income (expense, Unrealized Gain (Loss) on Derivatives |  |  | 0.2 |  | (0.4) |  | 0 |  | 0.1 |  |  |  |
Ending balance, Unrealized Gain (Loss) on Derivatives |  |  | 0.2 |  | 0.2 |  | 0.2 |  | 0.2 |  | 0.6 |  |
Beginning balance, Total |  |  |  | (40.3) |  |  | (41.9) |  | (80.1) |  | (78.7) |  |
Other comprehensive income (expense) before reclassifications |  |  | (8.8) |  | 1.8 |  | (9.1) |  | (0.5) |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  | 0.7 |  | 3.1 | [1] | 2.6 | [2] | 6.8 | [1] |  |  |
Net current-period other comprehensive income (expense |  |  | (8.1) |  | 4.9 |  | (6.5) |  | 6.3 |  |  |  |
Ending balance, Total |  |  | (48.4) |  | (73.8) |  | (48.4) |  | (73.8) |  | (78.7) |  |
Payments for Repurchase of Common Stock |  |  | $ 3.4 | $ 3.3 |  |  | $ 6.7 |  | $ 0 |  |  |  |
[1] | The change in actuarial losses in the three and nine months ended September 30, 2013 represents $2.2 million and $6.3 million, respectively, of actuarial losses that have been included in the computation of net postretirement pension expense and $0.7 million and $0.6 million, respectively, of income tax expense largely due to a change in the United Kingdom tax rate that was enacted during the prior year third quarter.
[2] | The change in actuarial losses in the three and nine months ended September 30, 2014 includes $1.4 million and $4.1 million, respectively, of actuarial losses that have been included in the computation of net postretirement pension expense for the period

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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_TreasuryStockSharesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration