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Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2016
Pension and other post-retirement plans
Pension plan contribution	$ 10.0	$ 9.2
Obligations and funded status
Defined accumulated benefit obligation plans	$ 585.9	$ 547.9
Expected rate of return on plan assets	4.28%	3.65%	4.56%
Pension plan assets yielded returns	7.50%	(3.20%)	22.30%
Pension plans assets
Asset allocation	99.00%
Savings plan
401(k) plan description	Under the 401(k) plan, eligible U.S. employees may voluntarily contribute a percentage of their eligible compensation. We match contributions made by employees who meet certain eligibility and service requirements. Our matching contribution is 100% of eligible employee contributions for the first 1% of eligible compensation and 50% of the next 5% of eligible compensation.
Annual eligible compensation percentage	1.50%
Other retirement compensation
Other accrued retirement compensation	$ 61.0	$ 65.8
Maximum
Pension plans assets
Expected contribution	27.0
Minimum
Pension plans assets
Expected contribution	22.0
U.S. Pension Plans
Pension and other post-retirement plans
Benefits paid	$ 12.1	$ 9.1
Obligations and funded status
Discount rate	4.02%	4.21%	3.63%
Non-US Pension Plans
Pension and other post-retirement plans
Benefits paid	$ 4.9	$ 4.4
Non-US Pension Plans \| Maximum
Obligations and funded status
Discount rate	0.50%	0.50%	0.50%
Expected rate of return on plan assets	5.50%	6.00%	6.00%
Non-US Pension Plans \| Minimum
Obligations and funded status
Discount rate	4.00%	4.25%	4.25%
Expected rate of return on plan assets		1.00%	1.00%	1.00%
First 1%
Savings plan
Matching contribution to eligible employee contributions	100.00%
Percent of eligible compensation	1.00%
Next 5%
Savings plan
Matching contribution to eligible employee contributions	50.00%
Percent of eligible compensation	5.00%
Flow 401(K) Plan
Savings plan
401(k) plan and ESOP combined expenese	$ 27.1	$ 26.5	$ 21.5