Defined Contribution and Defined Benefit Retirement - Schedule of Funded Status (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amounts recognized in the Consolidated Balance Sheets:
Pension asset	$ 2.7	$ 4.2
Noncurrent	(273.3)	(266.4)
Defined Benefit Pension Plans
Change in plan assets:
Fair value at beginning of the year	491.7
Fair value at end of year	454.0	491.7
Defined Benefit Pension Plans | U.S.
Change in benefit obligation:
Balance at beginning of the year	63.0	62.8
Interest cost	2.2	2.5	$ 2.7
Actuarial loss (gain)	(3.4)	1.9
Benefits paid	(4.2)	(4.2)
Balance at end of the year	57.6	63.0	62.8
Change in plan assets:
Fair value at beginning of the year	46.5	45.6
Actual return on plan assets	(2.5)	4.0
Employer contributions	3.4	1.1
Benefits paid	(4.2)	(4.2)
Fair value at end of year	43.2	46.5	45.6
Funded status	(14.4)	(16.5)
Amounts recognized in the Consolidated Balance Sheets:
Current	(0.2)	(0.3)
Noncurrent	(14.2)	(16.2)
Total recognized in balance sheet	(14.4)	(16.5)
Accumulated other comprehensive (income) loss:
Accumulated other comprehensive loss—Actuarial loss	39.0	37.2
Total amount recognized in balance sheet and AOCI	24.6	20.7
Accumulated benefit obligations (“ABO”)	$ 57.6	$ 63.0
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	$ 691.2	$ 603.4
Service cost	11.6	11.4	9.9
Interest cost	13.8	13.4	15.1
Participants' contributions	1.5	1.5
Actuarial loss (gain)	5.8	9.3
Plan settlement		(0.3)
Change in currency exchange rates	(33.9)	73.7
Benefits paid	(22.8)	(21.2)
Balance at end of the year	667.2	691.2	603.4
Change in plan assets:
Fair value at beginning of the year	445.2	381.8
Actual return on plan assets	(6.1)	24.1
Employer contributions	16.5	16.0
Participants' contributions	1.5	1.5
Change in currency exchange rates	(23.6)	43.0
Benefits paid	(22.8)	(21.2)
Fair value at end of year	410.7	445.2	$ 381.8
Funded status	(256.5)	(246.0)
Amounts recognized in the Consolidated Balance Sheets:
Pension asset	2.7	4.2
Noncurrent	(259.2)	(250.2)
Total recognized in balance sheet	(256.5)	(246.0)
Accumulated other comprehensive (income) loss:
Accumulated other comprehensive loss—Actuarial loss	254.1	242.8
Accumulated other comprehensive (income) loss - Prior service credit	1.2	1.5
Accumulated other comprehensive loss, Total	255.3	244.3
Total amount recognized in balance sheet and AOCI	(1.2)	(1.7)
Accumulated benefit obligations (“ABO”)	$ 642.2	$ 664.7
Defined Benefit Plan, Funding Status [Extensible List]	us-gaap:FundedPlanMember	us-gaap:FundedPlanMember