Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets Additions by Component (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
Schedule Of Other Intangible Assets [Line Items]
Additions to other intangible assets	$ 106.5
Trade names (indefinite-lived)
Schedule Of Other Intangible Assets [Line Items]
Amount	5.5
Customer Relationships
Schedule Of Other Intangible Assets [Line Items]
Amount	$ 96.3
Weighted Average Amortization Period	11 years 10 months 24 days
Trade names (indefinite-lived)
Schedule Of Other Intangible Assets [Line Items]
Amount	$ 4.6
Weighted Average Amortization Period	3 years
Non-Compete Agreements
Schedule Of Other Intangible Assets [Line Items]
Amount	$ 0.1
Weighted Average Amortization Period	5 years