Composition of Foreign Pension Plan Assets (Detail) (Pension Benefits, Foreign, USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 35.0	$ 35.7	$ 33.5
Equity Securities And Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.8	6.0
Fixed Income Securities And Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.7	10.9
Cash And Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16.5	18.8
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19.5	18.4
Level 1 | Equity Securities And Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.8	6.0
Level 1 | Fixed Income Securities And Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.7	10.9
Level 1 | Cash And Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.0	1.5
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15.5	17.3	16.2
Level 3 | Cash And Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 15.5	$ 17.3