Acquisitions - Consideration (Details) € in Millions, $ in Millions	Sep. 09, 2015 USD ($)	Jun. 08, 2015 USD ($)	Jun. 08, 2015 EUR (€)
Con-Way, Inc.
Business Acquisition [Line Items]
Cash consideration	$ 2,706.6
Liability for equity award settlement	30.9
Repayment of indebtedness	17.6
Cash acquired	(437.3)
Total consideration	$ 2,317.8
Norbert Dentressangle SA
Business Acquisition [Line Items]
Cash consideration		$ 1,603.9	€ 1,437.0
Liability for equity award settlement		13.2	11.8
Repayment of indebtedness		705.0	628.5
Noncontrolling interests		784.2	702.5
Cash acquired		(151.0)	(134.6)
Total consideration		$ 2,955.3	€ 2,645.2