Derivatives and Financial Instruments - Additional Information (Detail) € in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)
Derivative [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 4,411.3	$ 4,685.8
Description of Net Investment Hedge Activity	€500.0 million 2.45% Senior Notes due 2019
Gain (Loss) on Derivative Used in Net Investment Hedge, Net of Tax	$ 4.1	16.4
Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	543.9	331.5
Senior Notes [Member] | Senior Notes 2.45% Due 2019
Derivative [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 560.8	548.4	€ 500.0
Valves And Controls [Member]
Derivative [Line Items]
Goodwill, Impairment Loss		515.2
Impairment of Intangible Assets (Excluding Goodwill)		$ 39.5