Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation (Details 1)

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Share-Based Compensation (Details 1) (USD $)
In Millions, except Share data
6 Months Ended
Jun. 30, 2011
Incentive Plan and Independent Directors Stock Units  
Outstanding and nonvested at December 31, 2010, Shares 1,160,500
Granted, Shares 22,800
Vested, Shares (427,700)
Forfeited, Shares (10,000)
Outstanding and nonvested at June 30, 2011, Shares 745,600
Outstanding and nonvested at December 31, 2010, Weighted Average Grant Date Fair Value $ 13.76
Granted, Weighted Average Grant Date Fair Value $ 41.68
Vested, Weighted Average Grant Date Fair Value $ 17.65
Forfeited, Weighted Average Grant Date Fair Value $ 12.54
Outstanding and nonvested at June 30, 2011, Weighted Average Grant Date Fair Value $ 12.40
Outstanding and nonvested at December 31, 2010, Aggregate Fair Value $ 16.0
Granted, Aggregate Fair Value 0.9
Vested, Aggregate Fair Value (7.6)
Forfeited, Aggregate Fair Value (0.1)
Outstanding and nonvested at June 30, 2011, Aggregate Fair Value $ 9.2