Composition of Foreign Pension Plan Assets (Detail) - Pension Benefits, Foreign - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 32.5	$ 35.0	$ 35.7
Equity Securities And Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.0	5.8
Fixed Income Securities And Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.4	12.7
Cash And Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15.1	16.5
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18.3	19.5
Level 1 | Equity Securities And Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.0	5.8
Level 1 | Fixed Income Securities And Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.4	12.7
Level 1 | Cash And Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.9	1.0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14.2	15.5	$ 17.3
Level 3 | Cash And Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 14.2	$ 15.5