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Pension Plans (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Plan net pension credit/(charge):    
Service cost $ (0.4) $ (0.4)
Interest cost on projected benefit obligation (7.9) (8.0)
Expected return on plan assets 9.0 8.5
Amortization of prior service credit 0.3 0.3
Amortization of actuarial net losses (1.7) (0.3)
Total $ (0.7) $ 0.1