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Pension Plans - Defined Benefit Pension Plan (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Plan net pension credit/(charge):        
Service cost $ (0.3) $ (0.4) $ (0.7) $ (0.8)
Interest cost on projected benefit obligation (6.8) (8.8) (13.8) (17.5)
Expected return on plan assets 8.2 9.4 16.6 18.7
Amortization of prior service credit 0.3 0.3 0.6 0.7
Amortization of actuarial net losses (1.3) (1.4) (2.6) (2.8)
Net pension charge $ 0.1 $ (0.9) $ 0.1 $ (1.7)