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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock-Based Compensation        
Stock-based compensation expense (in dollars) $ 14.9 $ 16.4 $ 15.0  
Number of share options granted during the period (in shares) 400,000 700,000    
Exercise Price, low end of range $ 4.41      
Exercise Price, high end of range $ 47.84      
Unrecognized compensation expense (in dollars) 9.3      
2013 Omnibus Plan
       
Stock-Based Compensation        
Number of shares of common stock authorized under the plan 8,000,000      
Stock Options
       
Stock-Based Compensation        
Stock-based compensation expense (in dollars) 6.3 6.7 6.9  
Number of share options granted during the period (in shares) 400,000 700,000   1,000,000
Stock-based compensation expense, net of tax (in dollars) 4.0 4.2 4.3  
Unrecognized compensation expense (in dollars) 7.0      
Recognition period for unrecognized compensation expense (in years) 2 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 9.00 $ 7.97   $ 9.66
Total intrinsic value of stock options exercised 6.9 4.9 2.8  
Stock Options | Directors
       
Stock-Based Compensation        
Vesting rights, annual increments beginning on the grant date 0.25      
Anniversary period from grant date, for grants made prior to 2011 (in years) P1Y      
Expiration period 10 years      
Vesting period (in years) 4 years      
Stock Options | Officers and Employees
       
Stock-Based Compensation        
Vesting rights, annual increments beginning on the grant date 25% increments beginning on the first anniversary of the grant date      
Vesting Rights Percentage 25.00%      
Vesting rights percentage for grants made prior to 2011 (as a percent) 25.00%      
Anniversary period from grant date, for grants made prior to 2011 (in years) P2Y      
Vesting period for grants made prior to 2011 (in years) 4 years      
Expiration period for grants made prior to 2011 (in years) 10 years      
Stock Options | Stock Plan 2003 | Officers and Employees
       
Stock-Based Compensation        
Vesting rights, annual increments beginning on the grant date 25% increments beginning on the second anniversary of the grant date      
Vesting Rights Percentage 25.00%      
Anniversary period from grant date (in years) P2Y      
Expiration period 10 years      
Vesting period (in years) 4 years      
Stock Options | Director Stock Plan 2004 | Directors
       
Stock-Based Compensation        
Expiration period 10 years      
Restricted Stock
       
Stock-Based Compensation        
Expiration period 3 years      
Stock-based compensation expense (in dollars) 2.8 4.5 4.0  
Stock-based compensation expense, net of tax (in dollars) 1.8 2.8 2.5  
Unrecognized compensation expense (in dollars) 1.6      
Recognition period for unrecognized compensation expense (in years) 1 year 5 months 6 days      
Granted, shares 100,000.0 200,000.0 300,000.0  
Restricted Stock | Officers and Employees
       
Stock-Based Compensation        
Vesting rights percentage for grants made prior to 2011 (as a percent) 25.00%      
Restricted Stock | Stock Plan 2003 | Officers and Employees
       
Stock-Based Compensation        
Vesting rights, annual increments beginning on the grant date 100% on the third anniversary of the grant date      
Vesting Rights Percentage 100.00%      
Expiration period 3 years      
Restricted Stock | Director Stock Plan 2004 | Directors
       
Stock-Based Compensation        
Expiration period 3 years      
Performance shares
       
Stock-Based Compensation        
Stock-based compensation expense (in dollars) 5.8 5.2 4.1  
Stock-based compensation expense, net of tax (in dollars) $ 3.6 $ 3.3 $ 2.6  
Recognition period for unrecognized compensation expense (in years) 1 year 9 months 24 days      
Granted, shares 500,000.0 300,000.0 400,000.0  
Performance shares | Performance Shares 2013 [Member]
       
Stock-Based Compensation        
Percentage of shares paid based on total shareholder return relative to peer group of companies 50.00%      
Percentage of shares paid based on improvement in total leverage ratio 50.00%      
Performance shares | Performance Shares 2013 [Member] | Minimum
       
Stock-Based Compensation        
Granted, shares 0.0      
Performance shares | Performance Shares 2013 [Member] | Maximum
       
Stock-Based Compensation        
Granted, shares 800,000.0      
Performance shares | Performance Shares 2012
       
Stock-Based Compensation        
Period for meeting performance goals (in years) 3 years      
Percentage of shares paid based on total shareholder return relative to peer group of companies 50.00%      
Percentage of shares paid based on improvement in total leverage ratio 50.00%      
Performance shares | Performance Shares 2012 | Minimum
       
Stock-Based Compensation        
Granted, shares 0      
Performance shares | Performance Shares 2012 | Maximum
       
Stock-Based Compensation        
Granted, shares 700,000.0      
Performance shares | Performance Shares 2011
       
Stock-Based Compensation        
Period for meeting performance goals (in years) 2 years      
Percentage of shares paid based on total shareholder return relative to peer group of companies 50.00%      
Percentage of shares paid based on improvement in total leverage ratio 50.00%      
Percentage of shares paid after employment of entire second calendar year 25.00%      
Percentage of shares paid after two year performance period 75.00%      
Percentage of vesting rights on the third anniversary of grant date (as a percent) 25.00%      
ShareBasedCompensationArrangementByShareBasedPaymentTotalAwardSharesThatWillBeIssued 500,000      
Performance shares | Performance Shares 2011 | Minimum
       
Stock-Based Compensation        
Granted, shares 0      
Performance shares | Performance Shares 2011 | Maximum
       
Stock-Based Compensation        
Granted, shares 900,000.0      
Range of Exercise Price $36.04 - $47.84
       
Stock-Based Compensation        
Exercise Price, low end of range $ 36.04      
Exercise Price, high end of range $ 47.84      
Range of Exercise Price $4.41 - $7.49
       
Stock-Based Compensation        
Exercise Price, low end of range $ 4.41      
Exercise Price, high end of range $ 7.49