Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2021

Supplemental Cash Flow Elements [Abstract]

Schedule of Supplemental Cash Flow Information

	Year Ended December 31,
	2021		2020		2019
	(in millions of dollars)
Interest paid	$	48.7	$	29.4	$	23.6
Non-cash investing and financing activities (included in Accounts payable):
Unpaid purchases of property and equipment	$	14.0	$	4.5	$	4.5
Supplemental lease disclosures:
Operating lease liabilities arising from obtaining operating lease assets	$	27.8	$	5.4	$	1.8
Cash paid for amounts included in the measurement of    operating lease liabilities	$	8.2	$	4.5	$	3.8
Finance lease liabilities arising from obtaining finance lease assets	$	2.2	$	3.2	$	1.0
	As of December 31,
	2021		2020		2019
Components of cash, cash equivalents and restricted cash:
Cash and cash equivalents	$	303.2	$	780.3	$	264.3
Restricted cash included in Prepaid expenses and other current assets		—		—		0.3
Restricted cash included in Other assets		13.8		14.0		14.0
Total cash, cash equivalents and restricted cash shown in our Statements of    Consolidated Cash Flows	$	317.0	$	794.3	$	278.6