Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation - Restricted Share Awards (Details)

v2.4.0.6
Stock Based Compensation - Restricted Share Awards (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, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Fair value of restricted share units vested $ 5.6 $ 4.9 $ 2.1
Restricted Share Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Other Than Options, Vested, Beginning 653,000 491,000 423,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Other Than Options, Nonvested, Number, Beginning 331,000 193,000 160,000
Other Than Options, Granted 37,000 303,000 102,000
Other Than Options, Vested During Year (211,000) (162,000) (68,000)
Other Than Options, Forfeited (7,000) (4,000) (1,000)
Other Than Options, Nonvested, Number, Beginning 150,000 331,000 193,000
Other Than Options, Vested, Ending 864,000 653,000 491,000
Other Than Options, Vested, Weighted Average Grant Date Fair Value, Beginning $ 30.06 $ 30.20 $ 30.24
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Other Than Options, Nonvested, Weighted Average Grant Date Fair Value $ 28.39 $ 27.71 $ 28.13
Other Than Options, Granted, Weighted Average Grant Date Fair Value $ 26.40 $ 29.48 $ 28.37
Other Than Options, Vested During Year, Weighted Average Grant Date Fair Value $ 28.39 $ 29.80 $ 30.01
Other Than Options, Forfeited, Weighted Average Grant Date Fair Value $ 27.61 $ 28.10 $ 28.45
Other Than Options, Nonvested, Weighted Average Grant Date Fair Value $ 27.37 $ 28.39 $ 27.71
Other Than Options, Vested, Weighted Average Grant Date Fair Value, Ending $ 29.65 $ 30.06 $ 30.20
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 2.4    
Total compensation cost not yet recognized, period for recognition 17 months