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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 21, 2014 | Feb. 18, 2014 | Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Dividends declared, date |  | Feb. 18, 2014 |  |  |
Dividends declared per common share |  | $ 0.13 |  |  |
Dividends declared, payable date |  | Mar. 21, 2014 |  |  |
Dividends payable, date of record |  | Mar. 07, 2014 |  |  |
Dividends paid | $ 28.0 |  | $ 28.4 | $ 25.4 |
Share-based compensation expense |  |  | 14.5 | 7.6 |
Unrecognized pension items |  |  | 144.4 |  | 146.2
Reclassification of unrecognized pension items, net of taxes from accumulated other comprehensive income |  |  | 2 |  |
Stock Appreciation Rights Expense [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Outstanding SARs |  |  | 0.8 |  |
Remaining unvested SARs |  |  | 0.3 |  |
Weighted average remaining vesting life |  |  | 1 year |  |
Stock Appreciation Rights Expense [Member] | Other Current Liabilities [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Liability for SARs |  |  | 11 |  |
Stock Appreciation Rights Expense [Member] | Other Non-current Liabilities [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Liability for SARs |  |  | 9 |  |
Stock Appreciation Rights Expense [Member] | General and Administrative Expense [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Compensation expense |  |  | 1 | 18 |
Payments due to exercise SARs |  |  | 14 | 17 |
Liability for SARs |  |  | 20 |  |
Stock Appreciation Rights Expense [Member] | Restructuring Charges [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Compensation expense |  |  | 1 |  |
Payments due to exercise SARs |  |  | 0 |  |
Stock Appreciation Rights Expense [Member] | Restructuring Charges [Member] | Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Compensation expense |  |  | 1 | 1 |
Performance Stock Units [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
PSU awards performance period |  |  | 3 years |  |
Percentage of reduction in amount earned based on free cash flow performance |  |  | 25.00% |  |
Stock incentive plan description |  |  | To further balance the incentives, the amount earned based on free cash flow performance will be reduced by 25% if our relative TSR (as defined in the award) for the performance period is below a certain percentile of an approved peer group of companies. |  |
PSUs earned payment period |  |  | 2 years |  |
Share-based compensation expense |  |  | $ 2.0 |  |

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