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Income Taxes (ASC 740-10) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Tax Contingency [Line Items]        
Percentage of Likelihood for Realization of Benefit upon Ultimate Settlement 50.00%      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns        
Changes in prior year tax positions $ 1.9 $ 1.2    
Unrecognized Tax Benefits, Decreases Resulting from Current Period Tax Positions (20.2) (20.4)    
Changes in prior year tax positions     (6.1)  
Tax positions taken during the current year     5.4  
Lapse in statute of limitations 0 (10.5) 0  
Settlements with tax authorities (0.6) (0.6) (0.4)  
Balance at year end 46.6 65.5 95.8 96.9
Unrecognized tax benefit recognition including interest and penalties, if recognized, would effect income tax expense 17.7      
Unrecogized tax benefits reversal 28.9      
Interst (benefit) expense, net of any tax benefit 1.2 0.6 1.9  
Permanent Differences
        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns        
Changes in prior year tax positions 0.5 [1]   0.5 [1]  
Unrecognized Tax Benefits, Decreases Resulting from Current Period Tax Positions 0 [1] 0 [1]    
Changes in prior year tax positions   (0.9) [1]    
Tax positions taken during the current year     0.4 [1]  
Lapse in statute of limitations 0 [1] (3.4) [1] 0 [1]  
Settlements with tax authorities (0.4) [1] (0.6) [1] (0.3) [1]  
Balance at year end 9.7 [1] 9.6 [1] 14.5 [1] 13.9 [1]
Temporary Differences
        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns        
Changes in prior year tax positions 0 [2] 0.1 [2]    
Unrecognized Tax Benefits, Decreases Resulting from Current Period Tax Positions (20.2) [2] (20.4) [2]    
Changes in prior year tax positions     (8.5) [2]  
Tax positions taken during the current year     5.0 [2]  
Lapse in statute of limitations 0 [2] (5.7) [2] 0 [2]  
Settlements with tax authorities 0 [2] 0 [2] (0.1) [2]  
Balance at year end 28.9 [2] 49.1 [2] 75.1 [2] 78.7 [2]
Interest and Penalties
        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns        
Changes in prior year tax positions 1.4 [3] 2.0 [3] 1.9 [3]  
Unrecognized Tax Benefits, Decreases Resulting from Current Period Tax Positions 0 [3] 0 [3]    
Tax positions taken during the current year     0 [3]  
Lapse in statute of limitations 0 [3] (1.4) [3] 0 [3]  
Settlements with tax authorities (0.2) [3] 0 [3] 0 [3]  
Balance at year end   6.8 [3] 6.2 [3] 4.3 [3]
Accrued interest, net of any tax benefit $ 8.0 [3] $ 6.8 [3]    
[1] Represents the amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate.
[2] Represents the amount of unrecognized tax benefits that, if recognized would create a temporary difference between the reported amount of an item in the Company’s Consolidated Balance Sheet and its tax basis.
[3] Net of tax benefit.