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Pension Plans (Details 7) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Change in PBO      
Actuarial losses/(gains) $ 58.5 $ (19.5) $ (71.9)
German Plan [Member]
     
Change in PBO      
Opening balance 6.3 6.3  
Service cost 0.1 0.2 0.1
Interest cost 0.3 0.3 0.3
Benefits paid (0.2) (0.2)  
Actuarial losses/(gains) 2.6 0  
Exchange effect 0.2 (0.3)  
Closing balance $ 9.3 $ 6.3 $ 6.3