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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
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