Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss (Income) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss	$ (6.4)	$ 19.8
Amortization of actuarial loss	(6.5)	(7.6)
Business divestiture	(42.6)	0.0
Current year valuation adjustments	1.3	0.2
Settlement/curtailment (gain) loss	(4.4)	(0.7)
Total recognized in other comprehensive loss	(58.6)	11.7
U.S.
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss	2.3	3.6
Amortization of actuarial loss	(0.8)	(2.3)
Business divestiture	0.0	0.0
Current year valuation adjustments	0.0	0.3
Settlement/curtailment (gain) loss	(2.1)	(0.6)
Total recognized in other comprehensive loss	(0.6)	1.0
International
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss	(8.7)	16.2
Amortization of actuarial loss	(5.7)	(5.3)
Business divestiture	(42.6)	0.0
Current year valuation adjustments	1.3	(0.1)
Settlement/curtailment (gain) loss	(2.3)	(0.1)
Total recognized in other comprehensive loss	$ (58.0)	$ 10.7