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Credit Facilities and Long-term Debt - Borrowings Under Credit Facilities and Finance Lease Obligations (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jan. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2018 | Jan. 01, 2017 | [1] | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Finance Lease Liabilities |  |  |  | $ 757.9 | $ 204.4 |  |  |  |  |  |  |
Current portion of borrowings under applicable credit facility and finance lease obligations (3) |  |  |  | 107.7 | 37.9 | [1] |  |  |  | $ 56.0 |  |
Long-term portion of borrowings under applicable credit facility and finance lease obligations |  |  |  | 650.2 | 166.5 | [1] |  |  |  | $ 188.7 |  |
Accelerated amortization of unamortized deferred financing costs |  |  |  | 1.2 | 0.0 |  | $ 0.0 |  |  |  |  |
Payment for lease obligations |  |  |  | 17.0 | 6.5 | [2] | $ 4.5 | [2] |  |  |  |
Prior credit facility |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | 187.5 |  |  |  |  |  |  |
Accelerated amortization of unamortized deferred financing costs |  |  | $ 1.2 |  |  |  |  |  |  |  |  |
Prior Revolving Facility |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | 0.0 |  |  |  |  |  |  |
Accelerated amortization of unamortized deferred financing costs | $ 0.6 |  |  |  |  |  |  |  |  |  |  |
Prior Revolving Facility | Debt issuance costs, gross |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  | $ 1.7
Prior Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | 187.5 |  |  |  |  |  |  |
Accelerated amortization of unamortized deferred financing costs | 0.6 |  |  |  |  |  |  |  |  |  |  |
Prior Term Loan | Unamortized debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Finance Lease Liabilities |  |  |  |  | (0.8) |  |  |  |  |  |  |
Prior Term Loan | Debt issuance costs, gross |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  | $ 2.1 |
New credit facility |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | 757.3 |  |  |  |  |  |  |  |
New credit facility | Unamortized debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Finance Lease Liabilities |  |  |  | (9.8) |  |  |  |  |  |  |  |
New Term Loans |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | 598.3 |  |  |  |  |  |  |  |
New Term Loans, June | Debt issuance costs, gross |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ 4.9 |  | $ 4.9 |  |  |  |  |  |  |  |  |
New Term Loans, November | Debt issuance costs, gross |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  | $ 5.4 |  |  |
New Revolver |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | 159.0 |  |  |  |  |  |  |  |
New Revolver | Debt issuance costs, gross |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | 3.1 |  |  |  |  |  |  |  |
Finance Lease Obligations |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Finance Lease Liabilities |  |  |  | 10.4 | $ 17.7 |  |  |  |  |  |  |
Finance Lease Obligations | Solar panel manufacturing equipment |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | $ 11.1 |  |  |  |  |  |  |  |
Payment for lease obligations |  | $ 11.3 |  |  |  |  |  |  |  |  |  |
Payment for lease obligation, fees and accrued interest |  | $ 0.2 |  |  |  |  |  |  |  |  |  |
[1] | Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)
[2] | Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)

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