Defined Contribution and Defined Benefit Retirement - Schedule of Funded Status (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amounts recognized in the Consolidated Balance Sheets:
Pension asset	$ 7.4	$ 2.7
Noncurrent	(315.6)	(273.3)
Defined Benefit Pension Plans
Change in plan assets:
Fair value at beginning of the year	454.0
Fair value at end of the year	498.4	454.0
Defined Benefit Pension Plans | U.S.
Change in benefit obligation:
Balance at beginning of the year	57.6	63.0
Interest cost	2.3	2.2	$ 2.5
Actuarial loss (gain)	4.9	(3.4)
Benefits paid	(4.2)	(4.2)
Balance at end of the year	60.6	57.6	63.0
Change in plan assets:
Fair value at beginning of the year	43.2	46.5
Actual return on plan assets	5.5	(2.5)
Employer contributions	3.9	3.4
Benefits paid	(4.2)	(4.2)
Fair value at end of the year	48.4	43.2	46.5
Funded status	(12.2)	(14.4)
Amounts recognized in the Consolidated Balance Sheets:
Current	(0.3)	(0.2)
Noncurrent	(11.9)	(14.2)
Total recognized in balance sheet	(12.2)	(14.4)
Accumulated other comprehensive (income) loss:
Accumulated other comprehensive loss—Actuarial loss	38.5	39.0
Total amount recognized in balance sheet and AOCI	26.3	24.6
Accumulated benefit obligations ("ABO")	$ 60.6	$ 57.6
Defined Benefit Plan, Funding Status [Extensible List]	us-gaap:FundedPlanMember	us-gaap:FundedPlanMember
Defined Benefit Pension Plans | Foreign
Change in benefit obligation:
Balance at beginning of the year	$ 667.2	$ 691.2
Service cost	12.8	11.6	11.4
Interest cost	13.5	13.8	13.4
Participants' contributions	1.6	1.5
Actuarial loss (gain)	82.0	5.8
Plan settlement	(1.0)
Change in currency exchange rates	(6.6)	(33.9)
Benefits paid	(23.1)	(22.8)
Balance at end of the year	746.4	667.2	691.2
Change in plan assets:
Fair value at beginning of the year	410.7	445.2
Actual return on plan assets	47.0	(6.1)
Employer contributions	15.5	16.5
Participants' contributions	1.6	1.5
Change in currency exchange rates	(1.7)	(23.6)
Benefits paid	(23.1)	(22.8)
Fair value at end of the year	450.0	410.7	$ 445.2
Funded status	(296.4)	(256.5)
Amounts recognized in the Consolidated Balance Sheets:
Pension asset	7.4	2.7
Noncurrent	(303.8)	(259.2)
Total recognized in balance sheet	(296.4)	(256.5)
Accumulated other comprehensive (income) loss:
Accumulated other comprehensive loss—Actuarial loss	286.8	254.1
Accumulated other comprehensive (income) loss - Prior service credit	1.0	1.2
Accumulated other comprehensive loss, Total	287.8	255.3
Total amount recognized in balance sheet and AOCI	(8.6)	(1.2)
Accumulated benefit obligations ("ABO")	$ 720.3	$ 642.2
Defined Benefit Plan, Funding Status [Extensible List]	us-gaap:FundedPlanMember	us-gaap:FundedPlanMember