Debt and Credit Facility - Summary of Interest Expense Relating to Senior Notes and Revolving Credit Facility (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Interest expense on finance lease liabilities	$ 0.7	$ 0.3	$ 0.3
Total interest expense	46.9	48.3	49.5
Senior Notes and Revolving Credit Facility
Debt Instrument [Line Items]
Interest expense on finance lease liabilities	0.7	0.3	0.3
Interest expense capitalized as construction in progress	(6.4)	(3.6)	(1.2)
Total interest expense	46.9	48.3	49.5
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving Credit Facility interest expense, including commitment fees and finance cost amortization	3.0	2.0	1.4
Senior Notes
Debt Instrument [Line Items]
Senior Notes interest expense, including debt issuance cost amortization	$ 49.6	$ 49.6	$ 49.0