Annual report pursuant to Section 13 and 15(d)

Financial Instruments Financial Instruments, Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details)

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Financial Instruments Financial Instruments, Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivatives Qualifying as Hedges, Net of Tax [Roll Forward]      
Beginning balance, After-tax $ (4.3)    
Net change associated with current period hedging activity, After-tax (10.0) (9.8) (1.7)
Net amount recognized into earnings (loss), After-tax 3.6 5.8 (4.8)
Ending balance, After-tax (10.7) (4.3)  
Cash Flow Hedging [Member]
     
Derivatives Qualifying as Hedges, before Tax [Roll Forward]      
Beginning balance, Pretax (0.9) 3.1  
Net change associated with current period hedging activity, Pretax (10.0) (9.8)  
Net amount recognized into earnings (loss), Pretax 3.6 5.8  
Ending balance, Pretax (7.3) (0.9)  
Derivatives Qualifying as Hedges, Net of Tax [Roll Forward]      
Beginning balance, After-tax (4.3) (0.3)  
Net change associated with current period hedging activity, After-tax (10.0) (9.8)  
Net amount recognized into earnings (loss), After-tax 3.6 5.8  
Ending balance, After-tax $ (10.7) $ (4.3)