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Share-Based Compensation (Narrative) (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]      
Cash received from stock option exercises $ 0.1 $ 1.5 $ 0.4
Tax deductions for all share-based compensation 3.6 4.9  
Excess tax benefits (deficiencies) from stock-based compensation (0.6) [1],[2] 1.0 [1],[2] (0.1) [1],[2]
Weighted average fair value of options granted $ 18.20 $ 24.11 $ 13.91
Stock Option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax deductions for all share-based compensation 0.1 1.0 0.2
Weighted average fair value of options granted $ 32.50 $ 24.11 $ 13.91
Intrinsic value of options exercised 0.3 2.8 0.6
Fair value of shares vested 18.7 14.3 11.4
Compensation cost related to nonvested options not yet recognized 3.4 3.3  
Weighted average recognition period 1 year 9 months 18 days 1 year 9 months 18 days  
2005 Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized shares to be granted 5,800,000    
Shares reserved for future grants 2,700,000    
Option granted, expiration period 10 years    
Vesting period 3 years    
2000 Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 1,500,000    
Option granted, expiration period 10 years    
Vesting period 3 years    
1997 Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 4,700,000    
Restricted Stock and Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of shares vested 7.0 2.5 2.9
Compensation cost related to nonvested options not yet recognized 12.2    
Weighted average recognition period 2 years 4 months 28 days    
Nonvested stock and restricted stock units 193,000    
Weighted average grant price, per share expected to vested in next year $ 31.60    
Fair value of shares expected to vested in next year $ 6.1    
[1] See Note 23 - Restatement of Consolidated Financial Statements
[2] Cash inflows (outflows) recognized as financing and operating activities in the Company’s consolidated statement of cash flows