Pension and Other Postretirement Benefit Plans - Reconciliation of Change in Benefit Obligation, Change in Plan Assets and Amounts Recognized in Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Foreign
Change in benefit obligation:
Benefit obligation at end of period	$ 504.3
Pension | U.S.
Change in benefit obligation:
Benefit obligation at beginning of period	438.0	$ 558.0
Service cost	0.1	0.1	$ 0.1
Interest cost	18.6	19.8	21.8
Amendments and settlements	0.0	0.0
Actuarial (gain) loss	63.0	(43.1)
Benefits paid	(18.9)	(23.6)
Annuity purchase	0.0	(73.2)
Curtailment	0.0	0.0
Translation adjustment	0.0	0.0
Benefit obligation at end of period	500.8	438.0	558.0
Change in plan assets:
Fair value of plan assets at beginning of period	330.6	438.2
Actual return on plan assets	61.5	(13.7)
Employer contributions	3.4	2.9
Benefits paid	(18.9)	(23.6)
Annuity purchase	0.0	(73.2)
Translation adjustment	0.0	0.0
Fair value of plan assets at end of period	376.6	330.6	438.2
Funded status	(124.2)	(107.4)
Amounts recognized in the consolidated balance sheet:
Other long-term assets	0.1	0.0
Accrued liabilities	(2.6)	(2.3)
Other long-term liabilities	(121.7)	(105.1)
Pension | Foreign
Change in benefit obligation:
Benefit obligation at beginning of period	437.1	490.6
Service cost	6.3	6.9	7.3
Interest cost	14.7	14.7	15.0
Amendments and settlements	0.0	0.7
Actuarial (gain) loss	55.8	(21.8)
Benefits paid	(21.5)	(21.3)
Annuity purchase	0.0	0.0
Curtailment	(2.4)	0.4
Translation adjustment	14.3	(33.1)
Benefit obligation at end of period		437.1	490.6
Change in plan assets:
Fair value of plan assets at beginning of period	351.8	406.4
Actual return on plan assets	42.3	(11.7)
Employer contributions	6.6	7.3
Benefits paid	(21.5)	(21.3)
Annuity purchase	0.0	0.0
Translation adjustment	17.6	(28.9)
Fair value of plan assets at end of period	396.8	351.8	406.4
Funded status	(107.5)	(85.3)
Amounts recognized in the consolidated balance sheet:
Other long-term assets	23.8	29.0
Accrued liabilities	(3.3)	(2.9)
Other long-term liabilities	(128.0)	(111.4)
Other Postretirement | U.S.
Change in benefit obligation:
Benefit obligation at beginning of period	52.4	56.6
Service cost	0.0	0.0	0.1
Interest cost	2.1	1.9	2.4
Amendments and settlements	0.0	0.0
Actuarial (gain) loss	4.5	(1.8)
Benefits paid	(3.6)	(4.3)
Annuity purchase	0.0	0.0
Curtailment	0.0	0.0
Translation adjustment	0.0	0.0
Benefit obligation at end of period	55.4	52.4	56.6
Change in plan assets:
Fair value of plan assets at beginning of period	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	3.6	4.3
Benefits paid	(3.6)	(4.3)
Annuity purchase	0.0	0.0
Translation adjustment	0.0	0.0
Fair value of plan assets at end of period	0.0	0.0	0.0
Funded status	(55.4)	(52.4)
Amounts recognized in the consolidated balance sheet:
Other long-term assets	0.0	0.0
Accrued liabilities	(3.9)	(3.9)
Other long-term liabilities	(51.5)	(48.5)
Other Postretirement | Foreign
Change in benefit obligation:
Benefit obligation at beginning of period	34.3	41.2
Service cost	0.3	0.4	0.5
Interest cost	1.3	1.4	1.5
Amendments and settlements	0.0	0.0
Actuarial (gain) loss	0.4	(3.9)
Benefits paid	(1.3)	(1.6)
Annuity purchase	0.0	0.0
Curtailment	(10.9)	0.0
Translation adjustment	1.5	(3.2)
Benefit obligation at end of period	25.6	34.3	41.2
Change in plan assets:
Fair value of plan assets at beginning of period	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	1.3	1.6
Benefits paid	(1.3)	(1.6)
Annuity purchase	0.0	0.0
Translation adjustment	0.0	0.0
Fair value of plan assets at end of period	0.0	0.0	$ 0.0
Funded status	(25.6)	(34.3)
Amounts recognized in the consolidated balance sheet:
Other long-term assets	0.0	0.0
Accrued liabilities	(1.4)	(1.5)
Other long-term liabilities	$ (24.2)	$ (32.8)