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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 0 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended
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Apr. 11, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jul. 11, 2013 Subsequent Event [Member] | Jun. 30, 2013 Stock Appreciation Rights (SARs) [Member] | Jun. 30, 2013 Stock Appreciation Rights (SARs) [Member] General and administrative expense [Member] | Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] General and administrative expense [Member] | Jun. 30, 2013 Stock Appreciation Rights (SARs) [Member] General and administrative expense [Member] | Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] General and administrative expense [Member] | Jun. 30, 2013 Stock Appreciation Rights (SARs) [Member] General and administrative expense [Member] Other Current Liabilities [Member] | Jun. 30, 2013 Stock Appreciation Rights (SARs) [Member] General and administrative expense [Member] Other Noncurrent Liabilities [Member] | Jun. 30, 2013 Stock Appreciation Rights (SARs) [Member] Restructuring charges [Member] | Jun. 30, 2013 Stock Appreciation Rights (SARs) [Member] Restructuring charges [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.13 |  | $ 0.13 |  |  |  |  | $ 0.13 |  |  |  |  |  |  |  |  |
Estimated dividend payment |  | $ 25 |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |
Common stock outstanding |  | 195,847,923 |  |  | 195,847,923 |  | 194,557,669 |  |  |  |  |  |  |  |  |  |
Common stock dividends, cash paid |  | 25 | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
SARs outstanding |  |  |  |  |  |  |  |  | 1,900,000 |  |  |  |  |  |  |  |
Weighted average remaining vesting life |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Compensation expense |  | 0.1 |  | (9.1) | 18.1 | 2.7 |  |  |  | 1.0 |  | 18.0 | 3.0 |  |  | 1.0 | 1.0
Reduction in SARs expense |  |  |  |  |  |  |  |  |  |  | (9) |  |  |  |  |  |
Payment due to exercise SARs |  |  |  |  |  |  |  |  |  |  |  | 28 | 22 |  |  |  | 2
Liability for SARs |  |  |  |  |  |  |  |  |  | 32 |  | 32 |  | 8 | 24 | 1 | 1
Unrecognized pension items |  | 136.3 |  |  | 136.3 |  | 142.3 |  |  |  |  |  |  |  |  |  |
Reclassification from accumulated other comprehensive income, before tax |  | 1 |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from accumulated other comprehensive income, net of tax |  | $ 1 |  |  | $ 6 |  |  |  |  |  |  |  |  |  |  |  |

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