Commitments and Contingent Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of water cost purchased

Purchased water costs are shown below:

	(Millions of Dollars)
	Years Ended December 31,
Purchased Water	2018		2017		2016
Untreated	$	3.6	$	2.8	$	2.6
Treated		3.2		3.3		3.2
Total Costs	$	6.8	$	6.1	$	5.8

Schedule of future minimum operating lease

The minimum annual future rental commitment under operating leases that have initial or remaining non-cancelable lease terms over the next 5 years and thereafter are as follows:

Year	(Millions of Dollars) Annual Maturities
2019	$ 0.7
2020	$ 0.8
2021	$ 0.8
2022	$ 0.8
2023	$ 0.8
Thereafter	$ 5.3