Benefit Plans - Expected Future Services to Be Paid by Plans (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2018	$ 5.2
2019	5.8
2020	5.5
2021	6.1
2022	6.3
Thereafter	41.1
U.S.
Defined Benefit Plan Disclosure [Line Items]
2018	203.7
2019	178.3
2020	6.7
2021	6.7
2022	6.8
Thereafter	33.6
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
2018	3.1
2019	3.0
2020	2.9
2021	2.8
2022	2.7
Thereafter	$ 11.7