Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Amounts in Accumulated Other Comprehensive Loss, Not Yet Recognized (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service costs	$ 4.8	$ 0.7
Unrecognized net actuarial loss	178.1	146.1
Total	182.9	146.8
U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service costs	0.1	0.1
Unrecognized net actuarial loss	47.3	41.4
Total	47.4	41.5
International | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service costs	4.7	0.6
Unrecognized net actuarial loss	130.8	104.7
Total	$ 135.5	$ 105.3