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Financial Instruments (Narrative) (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Notional principal amount of interest rate swaps $ 900   $ 900  
Notional amount of foreign currency derivative hedges 815.3   815.3  
Commodity contracts outstanding 0   0  
Changes in net unrealized gains (losses) for nonderivative financial instruments in accumulated other comprehensive loss (10.3) 40.2 (35.0) 64.2
Interest Rate Swap [Member]
       
Unrealized gain (loss) on derivatives     $ 37.8