Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Amounts in Accumulated Other Comprehensive Loss Expected to be Recognized as Components of Benefit Costs (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service costs	$ 0.0
Unrecognized net actuarial loss	3.5
Total	3.5
U.S.
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service costs	0.0
Unrecognized net actuarial loss	1.0
Total	1.0
International
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service costs	0.0
Unrecognized net actuarial loss	2.5
Total	$ 2.5