Derivatives and Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	$ 13.3	$ 0.0	$ 0.0
Description of Net Investment Hedge Activity	we designated the €500 million 2.45% Senior Notes due 2019 (the "2019 Euro Notes") as a net investment hedge for a portion of our net investment in our Euro denominated subsidiaries
Gain (Loss) on Derivative Used in Net Investment Hedge, Net of Tax	$ 44.2	16.4
Cross Currency Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative Liability, Notional Amount	$ 475.6	331.5
Valves And Controls [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Goodwill, Impairment Loss		515.2
Impairment of Intangible Assets (Excluding Goodwill)		$ 39.5