Acquisitions - Bridge Terminal Transport - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
	May. 04, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired		$ 3,887.0	$ 814.0	$ 458.8
Goodwill		$ 4,610.6	$ 929.3	$ 363.4
Bridge Terminal Transport, Inc.
Business Acquisition [Line Items]
Consideration	$ 103.8
Acquisition of businesses, net of cash acquired	103.1
Business combination, consideration transferred, shares of stock	0.7
Goodwill	56.6
Intangible assets acquired	$ 30.0