Amounts Recognized In Consolidated Balance Sheets (Detail) (Pension Plans, Defined Benefit, USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Other assets	$ 1.2	$ 9.8
Accrued compensation and benefits	(3.6)	(4.6)
Other long-term liabilities	(86.0)	(65.6)
Net amount recognized	$ (88.4)	$ (60.4)