Commitments, Contingencies, and Uncertainties (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

At December 31, 2017, we were committed under noncancelable lease agreements for building and revenue equipment, requiring minimum annual rentals payable as follows:

(in millions)	2018		2019		2020		2021		2022		Thereafter
Minimum annual rentals	$	116.5	$	87.7	$	66.5	$	44.1	$	21.0	$	16.7