Acquisitions - Bridge Terminal Transport (Details) - USD ($) $ in Millions		9 Months Ended
	May. 04, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired		$ 1,609.8	$ 813.7
Business combination, consideration transferred, shares of stock		1.5	138.3
Goodwill		$ 3,445.0	$ 918.5	$ 929.3
BTT
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	54.1
Fair value of intangible assets	$ 30.0