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Change in Accumulated Other Comprehensive Loss (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | $ (80.1) |
Other comprehensive income (loss) before reclassifications | 28.6 |
Amounts reclassified from accumulated other comprehensive income (loss) | 9.6 |
Net current-period other comprehensive income (loss) | 38.2 |
Ending balance | (41.9) |
Actuarial Losses [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | (91.0) |
Other comprehensive income (loss) before reclassifications | 23.9 |
Amounts reclassified from accumulated other comprehensive income (loss) | 9.0 | [1]
Net current-period other comprehensive income (loss) | 32.9 |
Ending balance | (58.1) |
Foreign Currency Translation [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 10.8 |
Other comprehensive income (loss) before reclassifications | 4.5 |
Amounts reclassified from accumulated other comprehensive income (loss) | 0.7 |
Net current-period other comprehensive income (loss) | 5.2 |
Ending balance | 16.0 |
Unrealized Gain (Loss) on Derivatives [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 0.1 |
Other comprehensive income (loss) before reclassifications | 0.2 |
Amounts reclassified from accumulated other comprehensive income (loss) | (0.1) |
Net current-period other comprehensive income (loss) | 0.1 |
Ending balance | $ 0.2 |
[1] | The amounts reclassified from the actuarial losses component of accumulated other comprehensive loss in the year ended December 31, 2013 represents $8.4 million of actuarial losses that have been included in the computation of net post-retirement pension expense for the period, as disclosed in Note 7 - Pensions, and $0.6 million of income tax expense that has been recognized as a component of income tax benefit (expense), primarily due to a change in the United Kingdom tax rate that was enacted during the year ended December 31, 2013, as disclosed in Note 6 - Income Taxes.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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