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Pension Plans (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Plan net pension credit/(charge):        
Service cost $ (0.4) $ (0.4) $ (1.2) $ (1.2)
Interest cost on projected benefit obligation (8.0) (9.2) (24.0) (27.5)
Expected return on plan assets 8.4 9.3 25.4 27.7
Amortization of prior service credit 0.3 0.3 0.9 1.0
Amortization of actuarial net losses (0.3) (0.1) (0.9) (0.3)
Total $ 0 $ (0.1) $ 0.2 $ (0.3)