Employee Benefit Plans - Funded Status of Defined Benefit Pension Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amounts recognized in the balance sheet:
Noncurrent pension asset	$ 0.6	$ 0.4
Foreign Pension Plans, Defined Benefit
Change in projected benefit obligations (PBO):
Benefit obligations at beginning of the year	569.7	648.4
Service cost	9.9	11.2	$ 9.9
Interest cost	14.7	14.6	21.7
Participant contributions	1.5	1.6
Actuarial losses (gains)	33.7	(8.7)
Change in currency exchange rates	(15.0)	(76.4)
Benefits paid	(20.4)	(21.0)
Benefit obligations at end of the year	594.1	569.7	648.4
Change in plan assets:
Fair value of plan assets at beginning of the year	372.0	414.8
Actual return (loss) on plan assets	10.0	10.6
Employer contributions	15.3	17.1
Participant contributions	1.5	1.6
Change in currency exchange rates	(6.9)	(51.1)
Benefits paid	(20.4)	(21.0)
Fair value of plan assets at end of year	371.5	372.0	414.8
Funded status	(222.6)	(197.7)
Amounts recognized in the balance sheet:
Noncurrent pension asset	0.6	0.4
Accrued pension/OPEB costs, noncurrent	(223.2)	(198.1)
Total	(222.6)	(197.7)
Accumulated other comprehensive loss, Actuarial losses	257.5	230.6
Accumulated other comprehensive loss, Prior service cost	1.6	1.9
Accumulated other comprehensive loss, Total	259.1	232.5
Accumulated benefit obligations (ABO)	569.5	545.2
United States Pension Plans of US Entity, Defined Benefit
Change in projected benefit obligations (PBO):
Benefit obligations at beginning of the year	18.6	19.8
Interest cost	0.8	0.8	0.8
Actuarial losses (gains)	(0.6)	(1.0)
Benefits paid	(1.0)	(1.0)
Benefit obligations at end of the year	17.8	18.6	19.8
Change in plan assets:
Fair value of plan assets at beginning of the year	13.9	15.5
Actual return (loss) on plan assets	0.5	(0.7)
Employer contributions	0.2	0.1
Benefits paid	(1.0)	(1.0)
Fair value of plan assets at end of year	13.6	13.9	15.5
Funded status	(4.2)	(4.7)
Amounts recognized in the balance sheet:
Accrued pension/OPEB costs, current	(0.1)	(0.1)
Accrued pension/OPEB costs, noncurrent	(4.1)	(4.6)
Total	(4.2)	(4.7)
Accumulated other comprehensive loss, Actuarial losses	11.0	11.6
Accumulated benefit obligations (ABO)	17.8	18.6
OPEB
Change in projected benefit obligations (PBO):
Benefit obligations at beginning of the year	7.0	8.5
Service cost	0.1	0.1	0.1
Interest cost	0.3	0.3	0.4
Actuarial losses (gains)	(0.1)	(0.2)
Change in currency exchange rates	0.2	(1.3)
Benefits paid	(0.3)	(0.4)
Benefit obligations at end of the year	7.2	7.0	$ 8.5
Change in plan assets:
Benefits paid	(0.3)	(0.4)
Funded status	(7.2)	(7.0)
Amounts recognized in the balance sheet:
Accrued pension/OPEB costs, current	(0.3)	(0.3)
Accrued pension/OPEB costs, noncurrent	(6.9)	(6.7)
Total	(7.2)	(7.0)
Accumulated other comprehensive loss, Actuarial losses	2.9	3.1
Accumulated other comprehensive loss, Prior service cost	(5.5)	(6.2)
Accumulated other comprehensive loss, Total	$ (2.6)	$ (3.1)