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Debt and Credit Facility - Summary of Interest Relating to Senior Notes and Revolving Credit Facility (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Debt Instrument [Line Items] |  |  |  |
Total interest expense | $ 12.2 | $ 12.4 | $ 24.4 | $ 24.7
Senior Notes and Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense capitalized as construction in progress | (0.8) | (0.3) | (1.4) | (0.4)
Total interest expense | 12.2 | 12.4 | 24.4 | 24.7
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving Credit Facility commitment fees and finance cost amortization | 0.6 | 0.5 | 1.0 | 0.9
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes interest expense, including debt issuance cost amortization | $ 12.4 | $ 12.2 | $ 24.8 | $ 24.2

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