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Finance Costs - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about borrowings [line items] |  |  |  |
Finance costs paid | [1] | $ (65.5) | $ (50.0) | $ (26.0)
Credit Facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Finance costs paid |  | (65.5) | (50.0) |
Payment of debt issuance costs |  | $ 0.4 | $ 0.8 | $ 3.6
[1] | Finance costs paid include debt issuance costs paid of $0.4 in 2023 (2022— $0.8; 2021 — $3.6).

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- Definition Payment Of Debt Issuance Costs + References No definition available. + Details
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- Definition Payment Of Financing Costs And Waiver Fees + References No definition available. + Details
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Namespace Prefix: | cls_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |