Pension and Other Postretirement Benefit Plans - Amounts Recorded in Accumulated Other Comprehensive Loss Not Yet Recognized in Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
U.S. Pension
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	$ (138.1)	$ (14.2)
Prior service credit	0	0
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total	(138.1)	(14.2)
Foreign Pension
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	(97.6)	(50.1)
Prior service credit	0	0
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total	(97.6)	(50.1)
U.S. Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	11.7	4.4
Prior service credit	0	0
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total	11.7	4.4
Foreign Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial gain (loss)	(11.3)	(4.9)
Prior service credit	1.9	2.5
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total	$ (9.4)	$ (2.4)

Pension and Other Postretirement Benefit Plans - Amounts Recorded in Accumulated Other Comprehensive Loss Not Yet Recognized in Net Periodic Benefit Cost (Detail) (USD $)
In Millions, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2013

Defined Benefit Plan Disclosure [Line Items]

Net unrecognized actuarial gain (loss)

$ (138.1)

$ (14.2)

Prior service credit

Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total

(138.1)

(14.2)

Foreign Pension

Defined Benefit Plan Disclosure [Line Items]