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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Grant Date Fair Value of Shares Granted $ 23.97    
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options $ 11.4 $ 4.9 $ 14.8
Performance Share Units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period 3 years    
Approximate Shares Granted 100,000    
Weighted Average Grant Date Fair Value of Shares Granted $ 25.26    
Nonvested Awards, Total Compensation Cost Not yet Recognized 2.1    
Period for Recognition of Unrecognized Compensation Costs for Nonvested Awards 2 years    
Percentage of Shares Expected to Vest for Unrecognized Compensation Cost and Compensation Expense 100.00%    
Expected Volatility Rate 35.00%    
Expected Life 3 years    
Expected Dividend Rate 2.17%    
Risk Free Interest Rate 0.38%    
Performance Share Units | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Stock-based Awards Possible to be Earned 0.00%    
Performance Share Units | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Stock-based Awards Possible to be Earned 180.00%    
Restricted Stock Units (RSUs)
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Approximate Shares Granted 731,000    
Weighted Average Grant Date Fair Value of Shares Granted $ 24.68 $ 22.96 $ 26.13
Nonvested Awards, Total Compensation Cost Not yet Recognized 10.6    
Period for Recognition of Unrecognized Compensation Costs for Nonvested Awards 292 days    
Fair Value of Awards Vested During the Period 18.3 19.5 19.2
Restricted Stock Units (RSUs) | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period 1 year    
Restricted Stock Units (RSUs) | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period 3 years    
Cash Settled Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Approximate Shares Granted 60,000    
Weighted Average Grant Date Fair Value of Shares Granted $ 24.22 $ 23.23 $ 26.22
Nonvested Awards, Total Compensation Cost Not yet Recognized 0    
Fair Value of Awards Vested During the Period 2.4 1.5 0.7
Cash Used to Settle Awards 2.5 1.5 0.9
Cash Settled Awards | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period 1 year    
Cash Settled Awards | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period 3 years    
Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period for Recognition of Unrecognized Compensation Costs for Nonvested Awards 252 days    
Expected Volatility Rate 52.00% 52.00% 53.00%
Expected Life 6 years 6 years 5 years 6 months
Expected Dividend Rate 2.14% 1.80% 1.41%
Risk Free Interest Rate 1.12% 1.13% 2.37%
Intrinsic Value of Options Exercised 4.4 0.6 3.9
Fair Value of Options that Vested During the Period 2.4 2.3 2.7
Unrecognized Compensation Cost on Stock Options $ 0.6    
Weighted Average Grant Date Fair Value of Shares Granted $ 9.77 $ 9.78 $ 11.73
Stock Options | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period 1 year    
Stock Options | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period 3 years    
Stock Incentive Plan 2012
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 20,000,000    
Number of Shares for Each Full Value Award 1.76    
Total Duration of the Stock Incentive Plan 8 years    
Award Vesting Period 3 years    
Number of Shares Available for Grant 18,310,000    
Stock Incentive Plan 2007
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 35,000,000    
Number of Shares for Each Full Value Award 2.7    
Total Duration of the Stock Incentive Plan 8 years    
Award Vesting Period 3 years