Leases (Tables)

12 Months Ended

Dec. 31, 2022

Leases [Abstract]

Components of Lease Costs

Operating lease cost was $15.7 million, $15.3 million and $15.3 for the years ended December 31, 2022 , December 31, 2021 and December 31, 2020, respectively. The components of lease costs are as follows:

	December 31,
(millions of dollars)	2022		2021		2020
Operating lease cost	$	15.6	$	15.2	$	15.2
Short-term lease cost		0.1		0.1		0.1
Total	$	15.7	$	15.3	$	15.3

Supplemental Cash Flow Information and Non-cash Activity Related to Operating Leases

Supplemental cash flow information and non-cash activity related to our leases are as follows:

(millions of dollars)	December 31, 2022
Operating cash flows information:
Cash paid for amounts included in the measurement of lease liabilities	$	16.4
Non-cash activity:
Right-of-use assets obtained in the exchange for operating lease liabilities	$	13.1

Weighted Average Remaining Lease Term and Discount Rates

Weighted average remaining lease term, and weighted average discount rates related to the Company’s leases were as follows:

Weighted-average remaining operating lease term (in years)	6.20
Weighted-average operating leases discount rate	4.9	%

Outstanding Lease Assets and Liabilities

The following table summarizes the Company's outstanding lease assets and liabilities and their classification on the Consolidated Balance Sheet:

		December 31,
(millions of dollars)	Balance Sheet Classification	2022		2021
Right-of-use-asset	Other assets and deferred charges	$	49.1	$	49.6
Lease liability - current	Other current liabilities		13.5		11.7
Lease liability - non-current	Other non-current liabilities		43.9		47.2

Future Minimum Lease Payments

Future minimum lease payments under the Company's leases as of December 31, 2022 were as follows:

(millions of dollars)	December 31, 2022
2023	$	15.9
2024		12.9
2025		10.3
2026		8.9
2027		6.4
Thereafter		12.7
Total future minimum lease payments		67.1
Less imputed interest		(9.7	)
Total	$	57.4