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Commitments, Contingencies, and Uncertainties (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
At December 31, 2018, we were committed under noncancelable lease agreements for building and revenue equipment, requiring minimum annual rentals payable as follows:
(in millions)
2019
2020
2021
2022
2023
Thereafter
Minimum annual rentals
$
138.4

$
118.0

$
94.0

$
44.6

$
18.7

$
15.5