Pension and Other Postretirement Benefit Plans - Pretax Amounts Recorded in Accumulated Other Comprehensive Loss That Are Expected To Be Recognized As Components of Net Periodic Benefit Cost in Next Fiscal Year (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
U.S. Pension
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	$ (2.6)
Prior service credit	0.0
Total amounts recorded in accumulated other comprehensive loss that is expected to be recognized in the subsequent year	(2.6)
Foreign Pension
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	(5.1)
Prior service credit	0.0
Total amounts recorded in accumulated other comprehensive loss that is expected to be recognized in the subsequent year	(5.1)
U.S. Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	2.6
Prior service credit	0.0
Total amounts recorded in accumulated other comprehensive loss that is expected to be recognized in the subsequent year	2.6
Foreign Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	(0.3)
Prior service credit	0.3
Total amounts recorded in accumulated other comprehensive loss that is expected to be recognized in the subsequent year	$ 0.0