Derivatives and Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)		$ 13.3
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.
Debt, Long-term and Short-term, Combined Amount	$ 4,529.6	4,279.2
Gain (Loss) on Derivative Used in Net Investment Hedge, Net of Tax	24.1	44.2
Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 470.8	$ 475.6