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Debt - Schedule of Debt Outstanding (Details) - USD ($) $ in Millions	Mar. 28, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt, gross	$ 73.6
Unamortized debt issuance costs	(0.6)	$ (0.7)
Total debt	73.0	53.4
Less current portion	0.0	0.0
Long-term debt	73.0	53.4
Loan Notes | 4.88% Loan Notes due 2023
Debt Instrument [Line Items]
Long-term debt, gross	$ 25.0	25.0
Debt stated interest rate	4.88%
Loan Notes | 4.94% Loan Notes due 2026
Debt Instrument [Line Items]
Long-term debt, gross	$ 25.0	25.0
Debt stated interest rate	4.94%
Revolving credit facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 23.6	$ 4.1

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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