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Accumulated Other Comprehensive Loss (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Accumulated Other Comprehensive Income [Abstract]  
Loss on cash flow hedges$ (10.1)$ (13.7)
Deferred components of net periodic benefit cost(30.3)(25.8)
Total Accumulated other comprehensive loss$ (40.4)$ (39.5)