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, 2018	Dec. 31, 2017	Dec. 31, 2016
Foreign
Change in benefit obligation:
Benefit obligation at end of period	$ 437.1
Pension | U.S.
Change in benefit obligation:
Benefit obligation at beginning of period	558.0	$ 548.2
Service cost	0.1	0.1	$ 0.1
Interest cost	19.8	21.8	29.8
Amendments and settlements	0.0	0.0
Actuarial (gain) loss	(43.1)	13.5
Benefits paid	(23.6)	(25.6)
Annuity purchase	(73.2)	0.0
Curtailment	0.0	0.0
Special termination benefits	0.0	0.0
Translation adjustment	0.0	0.0
Benefit obligation at end of period	438.0	558.0	548.2
Change in plan assets:
Fair value of plan assets at beginning of period	438.2	412.6
Actual return on plan assets	(13.7)	49.1
Employer contributions	2.9	2.1
Benefits paid	(23.6)	(25.6)
Annuity purchase	(73.2)	0.0
Translation adjustment	0.0	0.0
Fair value of plan assets at end of period	330.6	438.2	412.6
Funded status	(107.4)	(119.8)
Amounts recognized in the consolidated balance sheet:
Other long-term assets	0.0	0.1
Accrued liabilities	(2.3)	(2.1)
Other long-term liabilities	(105.1)	(117.8)
Pension | Foreign
Change in benefit obligation:
Benefit obligation at beginning of period	490.6	442.5
Service cost	6.9	7.3	6.5
Interest cost	14.7	15.0	15.8
Amendments and settlements	0.7	0.0
Actuarial (gain) loss	(21.8)	11.7
Benefits paid	(21.3)	(23.6)
Annuity purchase	0.0	0.0
Curtailment	0.4	0.8
Special termination benefits	0.0	0.0
Translation adjustment	(33.1)	36.9
Benefit obligation at end of period		490.6	442.5
Change in plan assets:
Fair value of plan assets at beginning of period	406.4	367.1
Actual return on plan assets	(11.7)	28.2
Employer contributions	7.3	7.5
Benefits paid	(21.3)	(23.6)
Annuity purchase	0.0	0.0
Translation adjustment	(28.9)	27.2
Fair value of plan assets at end of period	351.8	406.4	367.1
Funded status	(85.3)	(84.2)
Amounts recognized in the consolidated balance sheet:
Other long-term assets	29.0	38.1
Accrued liabilities	(2.9)	(2.9)
Other long-term liabilities	(111.4)	(119.4)
Other Postretirement | U.S.
Change in benefit obligation:
Benefit obligation at beginning of period	56.6	64.7
Service cost	0.0	0.1	0.2
Interest cost	1.9	2.4	3.2
Amendments and settlements	0.0	0.0
Actuarial (gain) loss	(1.8)	(4.5)
Benefits paid	(4.3)	(4.0)
Annuity purchase	0.0	0.0
Curtailment	0.0	(2.1)
Special termination benefits	0.0	0.0
Translation adjustment	0.0	0.0
Benefit obligation at end of period	52.4	56.6	64.7
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	4.3	4.0
Benefits paid	(4.3)	(4.0)
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	(52.4)	(56.6)
Amounts recognized in the consolidated balance sheet:
Other long-term assets	0.0	0.0
Accrued liabilities	(3.9)	(4.2)
Other long-term liabilities	(48.5)	(52.4)
Other Postretirement | Foreign
Change in benefit obligation:
Benefit obligation at beginning of period	41.2	38.8
Service cost	0.4	0.5	0.5
Interest cost	1.4	1.5	1.6
Amendments and settlements	0.0	0.0
Actuarial (gain) loss	(3.9)	(0.7)
Benefits paid	(1.6)	(1.6)
Annuity purchase	0.0	0.0
Curtailment	0.0	(0.2)
Special termination benefits	0.0	0.1
Translation adjustment	(3.2)	2.8
Benefit obligation at end of period	34.3	41.2	38.8
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	1.6	1.6
Benefits paid	(1.6)	(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	(34.3)	(41.2)
Amounts recognized in the consolidated balance sheet:
Other long-term assets	0.0	0.0
Accrued liabilities	(1.5)	(1.5)
Other long-term liabilities	$ (32.8)	$ (39.7)