Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Amounts Included in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	$ 26.3	$ 39.1
Other current liabilities	(2.3)	(2.4)
Other non-current liabilities	(171.9)	(169.4)
Net amount recognized	(147.9)	(132.7)
U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	0.0	0.0
Other current liabilities	0.0	0.0
Other non-current liabilities	(62.1)	(56.1)
Net amount recognized	(62.1)	(56.1)
International | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	26.3	39.1
Other current liabilities	(2.3)	(2.4)
Other non-current liabilities	(109.8)	(113.3)
Net amount recognized	$ (85.8)	$ (76.6)