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Credit Facilities and Lease Obligations - Borrowings Under Credit Facilities and Lease Obligations (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings |  | $ 0 | $ 0 |  |
Lease obligations, comprised of lease obligations under IFRS 16 and lease obligations financed through third parties |  |  |  |  | $ 112,000,000.0
Borrowings and lease liabilities |  | 585,900,000 | 698,700,000 |  |
Current portion of borrowings under Credit Facility and lease obligations |  | 99,800,000 | 139,600,000 |  |
Long-term portion of borrowings under Credit Facility and lease obligations |  | 486,100,000 | 559,100,000 |  |
Accelerated amortization of unamortized deferred financing costs |  | 0 | 2,000,000.0 | $ 1,200,000 |
Current lease liabilities |  | 32,200,000 | 28,400,000 |  |
Non-current lease liabilities |  | 90,500,000 | 87,700,000 |  |
Borrowings |  | 0 | 0 |  |
Lease obligations recognized at January 1, 2019 under IFRS 16 |  |  |  |  | $ 112,000,000.0
Borrowings And Lease Liabilities |  | 585,900,000 | 698,700,000 |  |
Current portion of borrowings under credit facility & lease obligations |  | 99,800,000 | 139,600,000 |  |
Long-term portion of borrowings under credit facility & lease obligations |  | 486,100,000 | 559,100,000 |  |
Credit Facility |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings |  | 470,400,000 | 592,300,000 |  |
Accelerated amortization of unamortized deferred financing costs | $ 1,200,000 |  |  |  |
Borrowings |  | 470,400,000 | 592,300,000 |  |
Revolver |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings |  | 0 | 0 |  |
Borrowings |  | 0 | 0 |  |
Revolver | Debt issuance costs, gross |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings |  | 300,000 | 1,100,000 | 3,100,000 |
Borrowings |  | 300,000 | 1,100,000 | 3,100,000 |
Revolver | Aggregate Debt Issuance Costs |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings |  | 4,500,000 |  |  |
Borrowings |  | 4,500,000 |  |  |
Term Loans |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings |  | 470,400,000 | 592,300,000 |  |
Borrowings |  | 470,400,000 | 592,300,000 |  |
Term Loans | Unamortized debt issuance costs |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings |  | (7,200,000) | (9,700,000) |  |
Borrowings |  | (7,200,000) | (9,700,000) |  |
Term Loans | Debt issuance costs, gross |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings |  | 0 | 1,600,000 | 10,300,000 |
Borrowings |  | 0 | 1,600,000 | $ 10,300,000 |
Term Loans | Aggregate Debt Issuance Costs |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings |  | 11,900,000 |  |  |
Borrowings |  | 11,900,000 |  |  |
Lease Obligations |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Lease obligations, comprised of lease obligations under IFRS 16 and lease obligations financed through third parties |  | 122,700,000 | 116,100,000 |  |
Lease obligations recognized at January 1, 2019 under IFRS 16 |  | 122,700,000 | 116,100,000 |  |
Initial Term Loan |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings |  | 295,400,000 | 344,800,000 |  |
Borrowings |  | 295,400,000 | 344,800,000 |  |
New Term Loans, November |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings |  | 175,000,000.0 | 247,500,000 |  |
Borrowings |  | $ 175,000,000.0 | $ 247,500,000 |  |

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