v2.3.0.15
Long-term Equity-based Compensation Plans - Fair Value Assumptions (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]  
Options, Outstanding, Weighted Average Remaining Contractual Term4 
Options, Outstanding, Intrinsic Value$ 2.4 
Options, Vested and Expected to Vest, Outstanding, Number3,778,505 
Options, Grants in Period, Weighted Average Grant Date Fair Value$ 9.11$ 7.70
Options, Exercised in Period, Total Intrinsic Value0.1 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options, Outstanding at Beginning of the Year4,004,546 
Options, Outstanding, Weighted Average Exercise Price, Beginning of the Year$ 42.34 
Options, Granted in Period313,750 
Options, Granted in Period, Weighted Average Exercise Price$ 28.10 
Options, Exercised in Period(12,000) 
Options, Exercised in Period, Weighted Average Exercise Price$ 19.43 
Options, Forfeited and Expired in Period(498,494) 
Options, Forfeited and Expired in Period, Weighted Average Exercise Price$ 46.45 
Options, Outstanding at End of the Period3,807,802 
Options, Outstanding, Weighted Average Exercise Price, End of the Year$ 40.70 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]  
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term4 
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value2.4 
Options, Vested and Expected to Vest, Exercised, Number3,312,613 
Options, Vested and Expected to Vest, Exercised, Weighted Average Exercise Price$ 43.07 
Options, Vested and Expected to Vest, Exercised, Weighted Average Remaining Contractual Term4 
Options, Vested and Expected to Vest, Exercised, Aggregate Intrinsic Value1.8 
Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price$ 40.82 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant9,907,950 
Restricted Stock [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Restricted Stock, Nonvested Balance at Beginning of the Year218,156 
Restricted Stock, Nonvested Balance at Beginning of the Year$ 23.72 
Nonvested Restricted Stock, Granted in Period135,425 
Nonvested Restricted Stock, Granted in Period, Weighted Average Grant Date Fair Value$ 32.61 
Nonvested Restricted Stock, Vested in Period(50,821) 
Nonvested Restricted Stock, Vested in Period, Weighted Average Grant Date Fair Value$ 30.18 
Nonvested Restricted Stock, Forfeited in Period(907) 
Nonvested Restricted Stock, Forfeited in Period, Weighted Average Grant Date Fair Value$ 25.60 
Restricted Stock, Nonvested Balance at End of the Period301,853 
Restrited Stock, Nonvested Balance at End of the Period$ 26.62 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value1.42.2
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation$ 0.5$ 0.8
Time Vested Restricted Stock [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Nonvested Restricted Stock, Granted in Period69,950 
Restricted Stock, Nonvested Balance at End of the Period125,778 
Performance Based Restricted Stock [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Nonvested Restricted Stock, Granted in Period65,475 
Restricted Stock, Nonvested Balance at End of the Period176,075