Benefit Plans - Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Non-current liabilities	$ (287.2)	$ (322.0)
U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Assets, Noncurrent	0.5	2.7
Current liabilities	(4.1)	(4.0)
Non-current liabilities	(65.6)	(71.0)
Benefit obligations in excess of the fair value of plan assets	(69.2)	(72.3)
Non-US Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Assets, Noncurrent	6.1	6.5
Current liabilities	(4.0)	(4.7)
Non-current liabilities	(170.4)	(197.3)
Benefit obligations in excess of the fair value of plan assets	(168.3)	(195.5)
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Assets, Noncurrent	0.0	0.0
Current liabilities	(3.3)	(3.4)
Non-current liabilities	(35.5)	(38.1)
Benefit obligations in excess of the fair value of plan assets	$ (38.8)	$ (41.5)