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Leases and Commitments (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
(millions of dollars)
 
2018
$
23.0

2019
18.9

2020
9.2

2021
8.4

2022
7.0

After 2022
11.8

Total minimum lease payments
$
78.3