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Pension Plans (Details 1) (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)
Fair value of plan assets      
Pension (liability)/asset 0 21.4  
UK Plan [Member]
      
Change in PBO      
Interest cost 32.2 36.6 40.8
Service cost 1.6 1.6 1.6
Benefits paid (43.9) (45.7)  
Fair value of plan assets      
Opening balance 708.8 672.3  
Benefits paid (43.9) (45.7)  
Actual contributions by employer 9.2 9.8  
Actual return on assets 61.2 78.9  
Exchange effect 33.3 (6.5)  
Closing balance 768.6 708.8 672.3
Plan assets (deficit)/excess over PBO (36.7) 21.4  
Unrecognized net loss 177.8 103.1  
Amortization of actuarial net losses (1.3) (0.3) (5.2)
Amortization of prior service credit 1.3 1.3 0.9
Amount recognized in other comprehensive loss (177.8) (104.1)  
Pension (liability)/asset (36.7) 21.4  
UK Plan [Member] | Pension Benefit Obligation [Member]
      
Change in PBO      
Opening balance 687.4 684.0  
Interest cost 32.2 36.6  
Service cost 1.6 1.6  
Benefits paid (43.9) (45.7)  
Actuarial losses/(gains) 94.4 16.3  
Exchange effect 33.6 (5.4)  
Closing balance 805.3 687.4  
Fair value of plan assets      
Benefits paid $ (43.9) $ (45.7)