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Financial Instruments and Risk Management - Interest Rate Risk (Details) - USD ($) | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Feb. 28, 2022 | Dec. 06, 2021 | Sep. 30, 2021 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Nov. 30, 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 | $ 1,000,000.0 |  |  |  |  |  |  |  |  |
Maximum | Interest rate swaps |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Reasonably possible change in risk variable, impact on unrealized loss | 1,000,000.0 |  |  |  |  |  |  |  |  |
Borrowings | 0 | $ 0 |  |  |  |  |  |  |  |
Fair value gain/(loss) | (1,200,000) | (23,300,000) |  |  |  |  |  |  |  |
Contract amount of U.S. dollars | 539,500,000 | 562,600,000 |  |  |  |  |  |  |  |
Interest rate swaps |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Reasonably possible change in risk variable, impact on interest expense | 6,600,000 |  |  |  |  |  |  |  |  |
Gains on change in fair value of derivatives | 500,000 | 0 |  |  |  |  |  |  |  |
Losses on change in fair value of derivatives | 7,400,000 |  |  |  |  |  |  |  |  |
Reasonably possible change in risk variable, unhedged items, impact on interest expense | $ 4,600,000 |  |  |  |  |  |  |  |  |
Reasonably possible change in risk variable, percentage | 1.00% |  |  |  |  |  |  |  |  |
Fair value gain/(loss) | $ 6,900,000 | 16,500,000 |  |  |  |  |  |  |  |
Reasonable possible change in risk variable, decrease in unrealized loss, percentage | 0.25% |  |  |  |  |  |  |  |  |
Reasonable possible change in risk variable, unrealized loss, percentage | 0.25% |  |  |  |  |  |  |  |  |
Foreign currency forwards and swaps |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Reasonably possible change in risk variable, percentage | 1.00% |  |  |  |  |  |  |  |  |
New credit facility |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | $ 660,400,000 |  |  |  |  |  |  |  |  |
Contract amount of U.S. dollars |  |  |  |  |  |  | $ 800,000,000.0 |  |  |
Credit Facility |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | 660,400,000 | 470,400,000 |  |  |  |  |  |  |  |
Incremental Term Loan |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | 0 | 175,000,000.0 |  |  |  |  |  |  | $ 250,000,000.0 |
Hedged item, subject to cancellation | 75,000,000.0 |  |  |  |  |  |  |  |  |
Unhedged borrowings | 265,000,000.0 | 75,000,000.0 |  |  |  |  |  |  |  |
Contract amount of U.S. dollars | 0 | 100,000,000.0 |  |  |  |  |  |  |  |
Incremental Term Loan | Initial Swaps |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Hedged item, subject to cancellation |  |  |  |  | $ 75,000,000.0 |  |  |  |  |
Incremental Term Loan | Interest rate swaps |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Contract amount of U.S. dollars | 50,000,000.0 |  |  |  |  |  |  |  |  |
Term Loans |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | 660,400,000 | 470,400,000 |  |  |  | $ 592,300,000 |  | $ 598,300,000 |  |
Unhedged borrowings | 460,400,000 | 195,400,000 |  |  |  |  |  |  |  |
Contract amount of U.S. dollars | 200,000,000.0 | 275,000,000.0 |  |  |  |  |  |  |  |
Term Loans | Interest rate swaps |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Hedged item, liabilities | $ 200,000,000.0 |  |  |  |  |  |  |  |  |
Percentage of debt hedged | 30.00% |  |  |  |  |  |  |  |  |
Contract amount of U.S. dollars | $ 200,000,000.0 |  |  |  |  |  |  |  |  |
Initial Term Loan |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | 295,400,000 | 295,400,000 |  |  |  |  |  |  |  | $ 350,000,000.0
Unhedged borrowings | 195,400,000 | 120,400,000 |  |  |  |  |  |  |  |
Contract amount of U.S. dollars | 100,000,000.0 | 175,000,000.0 |  |  |  |  | $ 350,000,000.0 |  |  |
Initial Term Loan | Interest rate swaps | Initial Swaps |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Hedged item, liabilities | 100,000,000.0 |  |  |  |  |  |  |  |  |
Initial Term Loan | Interest rate swaps | Initial Swaps | Interest rate swap |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Hedged item, liabilities |  |  | $ 100,000,000.0 |  |  |  |  |  |  |
Initial Term Loan | Interest rate swaps | First Extended Initial Swaps |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Hedged item, liabilities | 100,000,000.0 |  |  |  |  |  |  |  |  |
First Incremental Term Loan | Interest rate swaps | Incremental Swaps |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Hedged item, liabilities | 100,000,000.0 |  |  |  |  |  |  |  |  |
Second Incremental Term Loan |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | 365,000,000.0 | 0 |  | $ 365,000,000.0 |  |  |  |  |  |
Contract amount of U.S. dollars | 100,000,000.0 | 0 |  |  |  |  |  |  |  |
Second Incremental Term Loan | Interest rate swaps | Incremental Swaps |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Hedged item, liabilities | 100,000,000.0 |  |  |  |  |  |  |  |  |
Second Incremental Term Loan | Interest rate swaps | Incremental Swaps | Interest rate swap |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Hedged item, liabilities |  |  | 100,000,000.0 |  |  |  |  |  |  |
Hedged item, subject to cancellation |  |  | 50,000,000.0 |  |  |  |  |  |  |
Second Incremental Term Loan | Interest rate swaps | Additional Incremental Swaps | Interest rate swap |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Hedged item, liabilities |  |  | $ 130,000,000.0 |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Unhedged borrowings | $ 0 | $ 0 |  |  |  |  |  |  |  |

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