Pension and Other Postretirement Benefit Plans - Pretax Amounts Recorded in Accumulated Other Comprehensive Loss That Are Expected To Be Recognized As Components of Net Periodic Benefit Cost in Next Fiscal Year (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014
U.S. Pension
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	$ (2.6)
Prior service credit	0
Total amounts recorded in accumulated other comprehensive loss that is expected to be recognized in the subsequent year	(2.6)
Foreign Pension
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	(3.0)
Prior service credit	0
Total amounts recorded in accumulated other comprehensive loss that is expected to be recognized in the subsequent year	(3.0)
U.S. Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	1.2
Prior service credit	0
Total amounts recorded in accumulated other comprehensive loss that is expected to be recognized in the subsequent year	1.2
Foreign Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	(0.6)
Prior service credit	0.4
Total amounts recorded in accumulated other comprehensive loss that is expected to be recognized in the subsequent year	$ (0.2)

Pension and Other Postretirement Benefit Plans - Pretax Amounts Recorded in Accumulated Other Comprehensive Loss That Are Expected To Be Recognized As Components of Net Periodic Benefit Cost in Next Fiscal Year (Detail) (USD $)
In Millions, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Defined Benefit Plan Disclosure [Line Items]

Net unrecognized actuarial gain (loss)

$ (2.6)

Prior service credit

Total amounts recorded in accumulated other comprehensive loss that is expected to be recognized in the subsequent year

(2.6)

Foreign Pension

Defined Benefit Plan Disclosure [Line Items]

Net unrecognized actuarial gain (loss)

(3.0)