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Pension Plans (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Plan net pension credit/(charge):        
Service cost $ (0.4) $ (0.4) $ (0.8) $ (0.8)
Interest cost on projected benefit obligation (8.0) (9.3) (16.0) (18.3)
Expected return on plan assets 8.5 9.3 17.0 18.4
Amortization of prior service credit 0.3 0.4 0.6 0.7
Amortization of actuarial net losses (0.3) (0.1) (0.6) (0.2)
Total $ 0.1 $ (0.1) $ 0.2 $ (0.2)