Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2023

Supplemental Cash Flow Elements [Abstract]

Schedule of Supplemental Cash Flow Information

	Year Ended December 31,
	2023		2022		2021
	(in millions of dollars)
Interest paid	$	43.8	$	45.7	$	48.7
Non-cash investing and financing activities (included in Accounts payable):
Unpaid purchases of property and equipment	$	19.3	$	28.9	$	14.0
Supplemental lease disclosures:
Operating lease liabilities arising from obtaining operating lease assets	$	3.2	$	3.1	$	27.8
Cash paid for amounts included in the measurement of    operating lease liabilities	$	9.3	$	9.8	$	8.2
Finance lease liabilities arising from obtaining finance lease assets	$	10.0	$	1.0	$	2.2
	As of December 31,
	2023		2022		2021
	(in millions of dollars)
Components of cash, cash equivalents and restricted cash:
Cash and cash equivalents	$	82.4	$	57.4	$	303.2
Restricted cash included in Other assets		18.3		13.9		13.8
Total cash, cash equivalents and restricted cash presented on our Statements of    Consolidated Cash Flows	$	100.7	$	71.3	$	317.0