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Financial Instruments and Risk Management - Interest Rate Risk (Details) - USD ($) | 1 Months Ended | 12 Months Ended | 13 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Aug. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018
Minimum |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Reasonably possible change in risk variable, impact on unrealized loss |  |  | $ 1,300,000 |  |  |  |
Maximum | Interest rate risk |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Reasonably possible change in risk variable, impact on unrealized loss |  |  | 800,000 |  |  |  |
Borrowings |  |  | 0 | $ 0 | $ 0 |  |
Fair value gain/(loss) |  |  | (23,300,000) | (4,500,000) |  |  |
Fair value gain/(loss) |  |  | 23,300,000 | 4,500,000 |  |  |
Contract amount of U.S. dollars |  |  | $ 562,600,000 | 523,900,000 | 523,900,000 |  |
Interest rate risk |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Reasonably possible change in risk variable, percentage |  |  | 1.00% |  |  |  |
Reasonably possible change in risk variable, impact on interest expense |  |  | $ 4,700,000 |  |  |  |
Reasonably possible change in risk variable, unhedged items, impact on interest expense |  |  | 2,000,000.0 |  |  |  |
Fair value gain/(loss) |  |  | $ 16,500,000 |  |  |  |
Reasonable possible change in risk variable, unrealized loss, percentage |  |  | 0.25% |  |  |  |
Fair value gain/(loss) |  |  | $ (16,500,000) |  |  |  |
New credit facility |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Borrowings |  |  | 470,400,000 |  |  |  |
Contract amount of U.S. dollars |  |  |  |  |  |  | $ 800,000,000.0
Prior credit facility |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Borrowings |  |  | 470,400,000 | 592,300,000 | 592,300,000 |  |
New Term Loans | Interest rate risk |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Hedged item, liabilities |  |  | 275,000,000.0 |  |  |  |
Incremental Term Loan |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Borrowings |  |  | 175,000,000.0 | 247,500,000 | $ 247,500,000 |  |
Hedged item, subject to cancellation |  |  | 75,000,000.0 |  |  |  |
Unhedged borrowings |  |  | 75,000,000.0 |  |  |  |
Incremental Term Loan | Interest rate risk |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Hedging instrument, term | 10 months |  |  |  | 5 years |  |
Hedged item, liabilities |  |  |  |  |  | $ 175,000,000.0 |
Term Loans |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Borrowings |  |  | 470,400,000 | 592,300,000 | $ 592,300,000 |  |
Unhedged borrowings |  |  | 195,400,000 | 242,300,000 | 242,300,000 |  |
Term Loans | Interest rate risk |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Contract amount of U.S. dollars |  |  | $ 275,000,000.0 |  |  |  |
Percentage of Debt Hedged |  |  | 58.00% |  |  |  |
Revolver |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Borrowings |  |  | $ 0 | 0 | 0 |  |
Unhedged borrowings |  |  | 0 |  |  |  |
Initial Term Loan |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Borrowings |  |  | 295,400,000 | $ 344,800,000 | $ 344,800,000 |  |
Unhedged borrowings |  |  | 120,400,000 |  |  |  |
Contract amount of U.S. dollars |  |  |  |  |  |  | $ 350,000,000.0
Initial Term Loan | Interest rate risk |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Hedging instrument, term |  | 5 years |  |  |  |  |
Hedged item, liabilities | $ 100,000,000.0 | $ 175,000,000.0 | $ 100,000,000.0 |  |  |  |

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