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Stock Compensation Plans Narrative (Details) (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]      
Maximum period stock options, appreciation rights, restricted stock, and restricted stock units can be granted 10 years    
Number of shares available for grant 22,000,000    
Number of Years Stock Options are Exercisable After Grant Date 10 years    
Stock options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation vesting period maximum 4 years    
Unrecognized stock compensation expense $ 0.2    
Weighted average period in which stock based compensation costs are expensed 1 year    
Aggregate instrinsic value of stock options exercised 10.8 8.6 0
Intrinsic value of outstanding stock options 56.7    
Intrinsic value of exercisable stock options 51.6    
Restricted stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation vesting period maximum 3 years    
Performance Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized stock compensation expense 1.3    
Weighted average period in which stock based compensation costs are expensed 1 year    
Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units outstanding vested but not yet paid 59,708    
Restricted Stock, Performance Shares, and Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized stock compensation expense 12.1    
Weighted average period in which stock based compensation costs are expensed 2 years    
Restricted stock shares vested during period, total fair value 12.7 3.7 15.9
Field long-term compensation plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation vesting period maximum 3 years    
Long-term incentive plan liability 12.6 5.9  
Senior management long-term compensation plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation vesting period maximum 3 years    
Long-term incentive plan liability $ 14.3    
Stock compensation plan price floor $ 5