Represents the assumption of expected long-term rate of return on plan assets.

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- References

No definition available.

+ Details

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- Definition

Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

+ References

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- Definition

Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

+ References

+ Details

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- Definition

Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

+ References

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- Definition

Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

+ References

+ Details

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- Definition

Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

+ References

+ Details

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- Definition

Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

+ References

+ Details

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- Definition

Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

+ References

+ Details

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Balance Type:	debit
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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References

No definition available.

+ Details

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

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- Details

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Retirement Plans - Plan Assets and Estimated Future Benefit Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement plans
Expected contribution in next fiscal year	$ 1.1
Estimated future benefit payments
Fiscal 2021	1.0
Fiscal 2022	1.1
Fiscal 2023	1.2
Fiscal 2024	1.2
Fiscal 2025	1.3
Fiscal 2026 ‑ Fiscal 2029	$ 8.0
Target and actual asset allocations
Total target plan assets	100.00%
Total actual plan assets	100.00%
Total assets	$ 31.3	$ 27.0	$ 22.2
United States Retirement Plan
Target and actual asset allocations
Expected long-term return assumption (percentage)	5.75%
Canadian Retirement Plan
Target and actual asset allocations
Expected long-term return assumption (percentage)	4.30%
Total equity based funds
Target and actual asset allocations
Total target plan assets	60.00%
Total actual plan assets	56.60%
Total assets	$ 17.7	15.0
U.S. equity
Target and actual asset allocations
Total assets	6.5	5.5
International equity
Target and actual asset allocations
Total assets	$ 11.2	9.5
Debt securities
Target and actual asset allocations
Total target plan assets	40.00%
Total actual plan assets	43.10%
Other
Target and actual asset allocations
Total target plan assets	0.00%
Total actual plan assets	0.30%
Common/collective trust - fixed income
Target and actual asset allocations
Total assets	$ 13.5	11.9
Money market funds
Target and actual asset allocations
Total assets	$ 0.1	$ 0.1