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Other Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Summary of Other Intangible assets      
Gross cost at January 1 $ 106.2 $ 51.2  
Capitalization of internally developed software and other costs 2.1 2.5  
Exchange effect 0 0  
Gross cost at March 31 108.3 53.7  
Accumulated amortization at January 1 (37.6) (33.5)  
Amortization expense (2.1) (1.0)  
Exchange effect (0.1) 0  
Accumulated amortization at March 31 (39.8) (34.5)  
Net book amount at March 31 $ 68.5 $ 19.2 $ 68.6