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Income Taxes Unrecognized Tax Benefts (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Contingency [Line Items]      
Unrecognized tax benefits, beginning balance $ 20.7 $ 25.8 $ 47.6
Increase in prior year tax positions 6.1 0 0
Decrease in prior year tax positions (4.4) (1.1) (0.8)
Increase in current year tax positions 4.0 0.4 1.3
Settlement (4.7) (4.4) (22.0)
Unrecognized tax benefits, ending balance 21.7 20.7 25.8
Unrecognized tax benefits, interest and penalties, beginning balance 10.2 7.4 21.4
Interest and penalties, increase in prior year tax positions 0.1 2.8 1.0
Interest and penalties, decrease in prior year tax positions (6.2) 0 (2.3)
Interest and penalties, increase in current year tax positions 0 0 0
Interest and penalties, settlement 0 0 (12.7)
Unrecognized tax benefits, interest and penalties, ending balance 4.1 10.2 7.4
Unrecognized tax benefits, income tax penalties and interest expense (6.1) 2.8 (1.3)
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations 1.5    
Expected cash payment related to settlement of IRS appeals   4.1 9.5
Unrecognized tax benefits, decrease resulting from cash and non-cash settlements with taxing authorities $ 8.4