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Goodwill and Other Intangible Assets (Details 1) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Gross carrying value and accumulated amortization of intangible assets    
Average Useful Life (Years) 6 years  
Gross Carrying Value $ 6.6 $ 6.6
Accumulated Amortization (5.3) (4.8)
Net Carrying Value 1.3 1.8
Developed software [Member]
   
Gross carrying value and accumulated amortization of intangible assets    
Average Useful Life (Years) 6 years  
Gross Carrying Value 6.0 6.0
Accumulated Amortization (4.9) (4.4)
Net Carrying Value 1.1 1.6
Patents [Member]
   
Gross carrying value and accumulated amortization of intangible assets    
Average Useful Life (Years) 10 years  
Gross Carrying Value 0.6 0.6
Accumulated Amortization (0.4) (0.4)
Net Carrying Value $ 0.2 $ 0.2