Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite Lived and Indefinite Lived Intangible Assets Excluding Goodwill [Line Items]
Amortization expense	$ 130.5	$ 119.5	$ 108.8
Estimated amortization expense, 2017	127.6
Estimated amortization expense, 2018	123.6
Estimated amortization expense, 2019	119.2
Estimated amortization expense, 2020	107.0
Estimated amortization expense, 2021	$ 88.5