Pension and Other Postretirement Benefit Plans - Amounts Recorded in Accumulated Other Comprehensive Loss Not Yet Recognized in Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
U.S. Pension
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	$ (110.1)	$ (135.9)
Prior service credit	0.0	0.0
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total	(110.1)	(135.9)
Foreign Pension
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	(100.9)	(73.4)
Prior service credit	0.0	0.0
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total	(100.9)	(73.4)
U.S. Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	25.1	13.6
Prior service credit	0.0	0.0
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total	25.1	13.6
Foreign Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	(6.1)	(5.4)
Prior service credit	0.9	1.2
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total	$ (5.2)	$ (4.2)