Number of shares of equity interests issued or issuable to acquire entity.

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Acquisitions - New Breed Logistics - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions			9 Months Ended
	Sep. 02, 2014	Jul. 29, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Business combination, consideration transferred, shares of stock			$ 1.5	$ 138.3
Acquisition of businesses, net of cash acquired			$ 1,609.8	$ 813.7
New Breed Logistics
Business Acquisition [Line Items]
Consideration	$ 615.9
Working capital adjustment	1.1
Business combination, consideration transferred, shares of stock	30.1
Acquisition of businesses, net of cash acquired	$ 585.8
Business acquisition, equity interest issued or issuable, number of shares	1,060,598
Common stock price per share (in usd per share)	$ 32.45
Cash consideration	$ 615.8
Chief Executive Officer \| New Breed Logistics
Business Acquisition [Line Items]
Business combination, consideration transferred, shares of stock		$ 30.0
Percentage of common stock acquired	50.00%	50.00%