Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets Additions by Component (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Other Intangible Assets [Line Items]
Additions to other intangible assets	$ 108.8	$ 205.0
Trade names (indefinite-lived)
Schedule Of Other Intangible Assets [Line Items]
Amount	5.5	8.7
Customer Relationships
Schedule Of Other Intangible Assets [Line Items]
Amount	$ 98.4	$ 178.2
Weighted Average Amortization Period	11 years 10 months 24 days	9 years 8 months 12 days
Trade names (indefinite-lived)
Schedule Of Other Intangible Assets [Line Items]
Amount	$ 4.6	$ 17.8
Weighted Average Amortization Period	3 years	10 years
Non-Compete Agreements
Schedule Of Other Intangible Assets [Line Items]
Amount	$ 0.3	$ 0.3
Weighted Average Amortization Period	4 years 3 months 18 days	3 years