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