Retirement Benefit Plans - Reconciliation of Beginning and Ending Balances of Foreign Pension Plan Assets Measured at Fair Value (Detail) - Foreign-based Defined Benefit Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Schedule of Fair Values of Plan Assets [Line Items]
Plan assets at fair market value - beginning of year	$ 385.4	$ 372.3
Translation loss	(12.3)	(35.3)
Plan assets at fair market value - end of year	505.6	385.4
Fair Value Measurements at Reporting Date Using: Significant Unobservable Inputs (Level 3) [Member]
Schedule of Fair Values of Plan Assets [Line Items]
Plan assets at fair market value - beginning of year	68.6
Gains on assets sold	0.2
Change in fair value of assets	2.2
Net purchases and sales	3.5
Translation loss	(0.6)
Plan assets at fair market value - end of year	$ 73.9	$ 68.6