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Income Taxes Uncertain tax positions (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Uncertain tax positions 0.00% (1.00%) 5.00%  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 12.8 $ 11.9    
Unrecognized Tax Benefits 48.9 49.9 23.5 11.3
Tax positions taken in current year 0 0.1 0  
Tax positions taken in prior years 0.4 33.9 12.9  
Tax positions taken in current year 0 0 (0.3)  
Tax positions taken in prior years 0 (7.4) (0.2)  
Settlements during the year 0 (0.2) (0.2)  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 0.2 1.8    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 5.7 $ 5.5