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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 0 Months Ended |
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Jul. 11, 2013 | Apr. 11, 2013 | Feb. 14, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 Stock Appreciation Rights (SARs) | Sep. 30, 2013 Stock Appreciation Rights (SARs) General and Administrative Expense | Sep. 30, 2012 Stock Appreciation Rights (SARs) General and Administrative Expense | Sep. 30, 2013 Stock Appreciation Rights (SARs) General and Administrative Expense | Sep. 30, 2012 Stock Appreciation Rights (SARs) General and Administrative Expense | Sep. 30, 2013 Stock Appreciation Rights (SARs) General and Administrative Expense Other Current Liabilities | Sep. 30, 2013 Stock Appreciation Rights (SARs) General and Administrative Expense Other Noncurrent Liabilities | Sep. 30, 2013 Stock Appreciation Rights (SARs) Restructuring Charges | Sep. 30, 2013 Stock Appreciation Rights (SARs) Restructuring Charges | Oct. 10, 2013 Subsequent Event | Oct. 31, 2013 Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.13 | $ 0.13 | $ 0.13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.13 |
Estimated dividend payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |
Common stock, shares outstanding |  |  |  | 196,148,264 |  |  |  | 196,148,264 |  | 194,557,669 |  |  |  |  |  |  |  |  |  |  | 196,000,000
Common stock dividends, cash paid |  |  |  |  | 25 | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SARs outstanding |  |  |  |  |  |  |  |  |  |  | 1,400,000 |  |  |  |  |  |  |  |  |  |
Weighted average remaining vesting life |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  | 8.7 |  |  | 2.9 | 26.8 | 5.6 |  |  | 9.0 | 3.0 | 27.0 | 6.0 |  |  | 1.0 | 1.0 |  |
Payment due to exercise SARs |  |  |  |  |  |  |  |  |  |  |  |  |  | 43 | 23 |  |  |  | 2 |  |
Liability for SARs |  |  |  |  |  |  |  |  |  |  |  | 25 |  | 25 |  | 8 | 17 | 1 | 1 |  |
Unrecognized pension items |  |  |  | 137.5 |  |  |  | 137.5 |  | 142.3 |  |  |  |  |  |  |  |  |  |  |
Reclassification from accumulated other comprehensive income, before tax |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from accumulated other comprehensive income, net of tax |  |  |  |  |  |  |  | $ 5 |  |  |  |  |  |  |  |  |  |  |  |  |

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