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Shareholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     161,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 2,635,640    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,886,882    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 27,079    
Employee Stock Ownership Plan (ESOP), Shares in ESOP 2,540,141    
Employee Stock Purchase Plan, Maximum Payroll Deduction 15.00%    
Employee Stock Purchase Plan, Percent of Total Share Value 95.00%    
Proceeds from ESPP $ 0.5 $ 0.3  
Shares from ESPP 21,446 13,027  
Stock Repurchase Program, Authorized Amount 200.0    
Stock Repurchase Program, Remaining Authorized Repurchase Amount 64.1    
Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense 7.6 3.0 1.1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Allocated Share-based Compensation Expense, Net of Tax 5.6 2.2 0.6
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 12.9    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 2 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Total Grant Date Fair Value 4.7 1.7 0.4
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense 3.8 9.1 13.0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 472,000 855,000 991,000
Outstanding, beginning balance, Weighted Average Grant Date Fair Value per Share (in dollars per share) $ 37.39 $ 38.23 40.31
Granted (in shares) 0 0 285,000
Granted, Weighted Average Grant Date Fair Value per Share (in dollars per share) $ 0.00 $ 0.00 28.30
Vested (in shares) (290,000) (368,000) (350,000)
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share) $ 42.11 $ 39.25 36.16
Forfeited (in shares) (8,000) (15,000) (71,000)
Forfeited, Weighted Average Grant Date Fair Value per Share (in dollars per share) $ 30.30 $ 39.62 37.62
Outstanding, ending balance (in shares) 174,000 472,000 855,000
Outstanding, ending balance, Weighted Average Grant Date Fair Value per Share (in dollars per share) $ 29.83 $ 37.39 38.23
Allocated Share-based Compensation Expense, Net of Tax 2.8 6.7 7.7
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value 12.2 14.4 12.7
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 0.5    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 0 years 2 months