Leases and Commitments (Tables)

12 Months Ended

Dec. 31, 2016

Leases [Abstract]

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

(millions of dollars)
2017	$	24.1
2018	8.0
2019	6.4
2020	6.5
2021	6.3
After 2021	3.8
Total minimum lease payments	$	55.1