Pension And Other Postretirement Benefit Plans - Additional Information (Detail) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2016 USD ($)		Dec. 31, 2016 USD ($) h		Dec. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of years balance is paid to participant after retirement			15 years
Accumulated pension plan benefit obligation	$ 537.6		$ 537.6		$ 526.4
Pension plans with benefit obligations in excess of plan assets, fair value of assets	469.7		469.7		444.7
Aggregate benefit obligation	589.3		589.3		576.3
Pension plans with accumulated benefit obligations in excess of plan assets, fair value of assets	8.0		8.0		7.1
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	94.6		94.6		96.6
Non-cash curtailment gain (loss)	5.3
Net gain (loss)			(16.7)		(41.3)
Net gain (loss) after tax			(11.3)		(26.5)
Discretionary contribution pension plans			$ 30.0
Hours of service eligible for defined contribution plan | h			1,000
Long-term deferred compensation arrangement, expense			$ 6.9		5.5		$ 6.9
Long-term deferred compensation arrangement, liability	36.1		36.1		35.4
Change in Assumptions for Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net pension periodic cost			(4.8)
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Plan assets fair value	86.8		86.8		107.8
Benefit obligation	102.4		102.4		123.1
Accumulated pension plan benefit obligation	87.6		87.6		105.5
Net pension periodic cost			(0.5)		4.4		4.2
Non-Qualified Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	86.4		86.4		78.9
Accumulated pension plan benefit obligation	82.8		82.8		75.1
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Plan assets fair value	469.7	[1]	469.7	[1]	462.6	[1]	455.6
Benefit obligation	589.3		589.3		586.9		544.0
Non-cash curtailment gain (loss)			5.3		0.0		0.0
Estimated net actuarial loss for pension benefits			12.7
Net pension periodic cost			20.8		30.5		30.2
Foreign Defined Contribution Plan
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan and small pension arrangement			5.3		5.1		5.1
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 6.2		6.2		7.0
Net pension periodic cost			0.3		0.4		0.5
Amounts recognized in accumulated other comprehensive loss			1.5		2.0
After tax amount			0.9		1.3
Domestic Defined Contribution Plan
Defined Benefit Plan Disclosure [Line Items]
Amounts charged to income for defined contribution retirement plan			$ 16.0		$ 15.9		$ 14.1

[1] There were no plan assets categorized as Level 3 at December 31, 2016 or 2015.