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Leases and Commitments (Tables)
12 Months Ended
Dec. 31, 2018
Leases [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
(millions of dollars)
 
2019
$
24.3

2020
20.6

2021
15.5

2022
12.6

2023
10.4

After 2023
37.9

Total minimum lease payments
$
121.3