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Pension Plans (Details 4) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Plan net pension charge      
Net pension credit total $ (0.3) $ 0.5 $ 10.8
UK Plan [Member]
      
Plan net pension charge      
Service cost 1.6 1.6 1.6
Interest cost on PBO 32.2 36.6 40.8
Expected return on plan assets (34.1) (36.7) (35.9)
Amortization of prior service credit (1.3) (1.3) (0.9)
Amortization of actuarial net losses 1.3 0.3 5.2
Net pension credit total (0.3) 0.5 10.8
UK Plan [Member] | Forecast [Member]
      
Plan net pension charge      
Service cost 1.6    
Interest cost on PBO 32.5    
Expected return on plan assets (36.9)    
Amortization of prior service credit (1.3)    
Amortization of actuarial net losses 7.0    
Net pension credit total $ 2.9