Benefit Plans - Reconciliations of Benefit Obligations, Fair Value of Plan Assets and Funded Status of Pension Plans and Other Post-Retirement Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in plan assets
Fair value of plan assets beginning of year	$ 374.3
Fair value of plan assets end of year	390.1	$ 374.3
U.S. Pension Plans
Change in benefit obligations
Benefit obligation beginning of year	396.9	416.2
Service cost	11.2	14.0	$ 13.1
Interest cost	16.4	14.9	15.4
Actuarial loss	0.9	(39.1)
Translation (gain) loss	0.0	0.0
Benefits paid	(12.1)	(9.1)
Benefit obligation end of year	413.3	396.9	416.2
Change in plan assets
Fair value of plan assets beginning of year	327.7	343.9
Actual return on plan assets	24.6	(11.1)
Company contributions	4.2	4.0
Translation gain (loss)	0.0	0.0
Benefits paid	(12.1)	(9.1)
Fair value of plan assets end of year	344.4	327.7	343.9
Funded status
Plan assets less than benefit obligation	(68.9)	(69.2)
Non-US Pension Plans
Change in benefit obligations
Benefit obligation beginning of year	173.4	189.6
Service cost	6.6	7.8	5.3
Interest cost	4.1	3.9	5.3
Actuarial loss	16.8	(6.5)
Translation (gain) loss	(9.2)	(17.0)
Benefits paid	(4.9)	(4.4)
Benefit obligation end of year	186.8	173.4	189.6
Change in plan assets
Fair value of plan assets beginning of year	46.6	49.9
Actual return on plan assets	3.0	1.3
Company contributions	5.8	5.2
Translation gain (loss)	(4.8)	(5.4)
Benefits paid	(4.9)	(4.4)
Fair value of plan assets end of year	45.7	46.6	49.9
Funded status
Plan assets less than benefit obligation	(141.1)	(126.8)
Post-retirement
Change in benefit obligations
Benefit obligation beginning of year	38.8	41.5
Service cost	0.2	0.2
Interest cost	1.5	1.5
Actuarial loss	(0.5)	(0.9)
Translation (gain) loss	0.0	0.0
Benefits paid	(3.1)	(3.5)
Benefit obligation end of year	36.9	38.8	41.5
Change in plan assets
Fair value of plan assets beginning of year	0.0	0.0
Actual return on plan assets	0.0	0.0
Company contributions	3.1	3.5
Translation gain (loss)	0.0	0.0
Benefits paid	(3.1)	(3.5)
Fair value of plan assets end of year	0.0	0.0	$ 0.0
Funded status
Plan assets less than benefit obligation	$ (36.9)	$ (38.8)