Amounts Included in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
U.S. Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	$ 378.1	$ 381.0
Prior Service Cost	(2.3)	(2.7)
Gross Amount in Accumulated Other Comprehensive Income	375.8	378.3
Income Tax Effect	142.3	143.1
Net Amount in Accumulated Other Comprehensive Income	233.5	235.2
Non U.S. Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	55.8	51.6
Prior Service Cost	0.0	0.0
Gross Amount in Accumulated Other Comprehensive Income	55.8	51.6
Income Tax Effect	6.7	5.9
Net Amount in Accumulated Other Comprehensive Income	49.1	45.7
Supplemental Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Actuarial Loss	67.4	66.1
Prior Service Cost	0.8	1.0
Gross Amount in Accumulated Other Comprehensive Income	68.2	67.1
Income Tax Effect	25.8	25.3
Net Amount in Accumulated Other Comprehensive Income	$ 42.4	$ 41.8