Amount of Accumulated Other Comprehensive Income Expected to be Recognized in Net Periodic Benefit Cost (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Pension Benefits, Domestic
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 6.7
Pension Benefits, Foreign
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	0.7
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	7.4
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ (0.2)