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Share-Based Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2014
Performance Shares PSU [Member]
Mar. 31, 2014
Market Share Units MSU [Member]
Mar. 31, 2014
Restricted Stock Units RSU [Member]
Mar. 31, 2014
Deferred Stock Units DSU [Member]
Dec. 31, 2013
Deferred Stock Units DSU [Member]
Mar. 31, 2014
PSU MSU Total [Member]
Mar. 31, 2014
RSU DSU Total [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares underlying options 186,800 82,900          
Share Price $ 33.29 $ 33.29          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]              
Expected volatility - weighted average 38.00% 38.00%          
Risk-free interest rate - weighted average 0.70% 0.70%          
Expected term in years 2 years 8 months 12 days 2 years 8 months 12 days          
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Aggregate Weighted Average Grant Date Fair Value $ 5.7 $ 2.6          
Weighted-average fair value estimates at grant date $ 30.71 $ 30.87          
Nonvested share activity [Rollforward]              
Beginning balance - shares 199,300 96,200 396,400 19,200 19,200 295,500 415,600
Stock units granted - shares 186,800 82,900 128,700     269,700 128,700
Cancelled awards - shares (1,700) 0 (3,700)     (1,700) (3,700)
Vested - shares     (10,400)       (10,400)
Ending balance - shares 384,400 179,100 511,000 19,200 19,200 563,500 530,200
Weighted-average grant-date fair value [Rollforward]              
Beginning Balance - grant-date fair value           $ 26.28 $ 24.68
Stock units granted - grant-date fair value           $ 30.76 $ 30.20
Cancelled awards - grant-date fair value           $ 26.22 $ 24.63
Vested - grant-date fair value             $ 30.48
Ending Balance - grant-date fair value           $ 28.42 $ 25.91