Amounts Included in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
U.S. Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	$ 381.0	$ 382.9
Prior Service Cost	(2.7)	(3.1)
Gross Amount in Accumulated Other Comprehensive Income	378.3	379.8
Income Tax Effect	143.1	143.3
Net Amount in Accumulated Other Comprehensive Income	235.2	236.5
Non U.S. Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	51.6	60.5
Prior Service Cost	0.0	0.0
Gross Amount in Accumulated Other Comprehensive Income	51.6	60.5
Income Tax Effect	5.9	6.3
Net Amount in Accumulated Other Comprehensive Income	45.7	54.2
Supplemental Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	66.1	81.5
Prior Service Cost	1.0	1.1
Gross Amount in Accumulated Other Comprehensive Income	67.1	82.6
Income Tax Effect	25.3	30.9
Net Amount in Accumulated Other Comprehensive Income	$ 41.8	$ 51.7