Plan Status of U.S. Plan, Non-U.S. Plan, and supplemental Plan (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 953.2	$ 903.4
Projected Benefit Obligation	1,062.7	1,006.5	$ 1,091.5
Plan Assets at Fair Value	1,393.5	1,342.0	1,440.8
Funded Status at end of year	$ 330.8	$ 335.5
Weighted-Average Assumptions:
Discount Rates	4.46%	4.71%
Rate of Increase in Compensation Level	4.39%	4.25%
Expected Long-Term Rate of Return on Assets	6.75%	7.00%
Non U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 158.3	$ 156.5
Projected Benefit Obligation	155.9	156.5	184.6
Plan Assets at Fair Value	139.3	144.3	157.6
Funded Status at end of year	$ (16.6)	$ (12.2)
Weighted-Average Assumptions:
Discount Rates	2.39%	3.39%
Expected Long-Term Rate of Return on Assets	3.22%	3.73%
Supplemental Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 108.9	$ 102.1
Projected Benefit Obligation	121.1	113.9	$ 123.0
Plan Assets at Fair Value	0.0	0.0
Funded Status at end of year	$ (121.1)	$ (113.9)
Weighted-Average Assumptions:
Discount Rates	4.46%	4.71%
Rate of Increase in Compensation Level	4.39%	4.25%