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Income Taxes Unrecognized Tax Benefts (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]        
Unrecognized Tax Benefits, Beginning Balance $ 25.8 $ 47.6 $ 40.6 $ 40.6
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions   0 6.2 0.5
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions   (0.8) (0.2) (1.2)
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions   1.3 1.0 0.7
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities   (22.3) 0  
Expected cash payment related to settlement of IRS appeals 4.1      
Unrecognized Tax Benefits, Ending Balance   25.8 47.6 40.6
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Beginning Balance 7.4 21.4 15.3 5.2
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Increases Resulting from Prior Period Tax Positions   1.0 6.1 4.1
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Decreases Resulting from Prior Period Tax Positions   (2.3) 0 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Increases Resulting from Current Period Tax Positions   0 0.3 6.0
Tax Adjustments, Settlements and Unusual Provisions, Interest and Penalties   (12.7) (0.3)  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Ending Balance   7.4 21.4 15.3
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense   (1.3) 6.1 10.1
Internal Revenue Service (IRS) [Member]
        
Income Tax Contingency [Line Items]        
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities   28.7    
Foreign Country [Member]
        
Income Tax Contingency [Line Items]        
Tax Adjustments, Settlements, and Unusual Provisions   $ 9.5