Defined Benefit Plan, Participant Commencement Age

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Number of post-retirement plans not frozen to new participants

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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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.

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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.

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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.

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Amount of cost for defined contribution plan.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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Pension and Other Retiree Benefits (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) yr	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of post-retirement plans not frozen to new participants	1
Pension and post-retirement benefit obligations	$ 317.1	$ 283.2
Employer contributions	19.5
Expected contributions to defined benefit plans for 2021	25.0
Costs related to defined contribution plans	6.8	12.4	$ 13.3
Esselte Leitz Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Unfunded Pension Plan liability	$ 167.9	151.5
Minimum
Defined Benefit Plan Disclosure [Line Items]
Payment of retirement benefits, commencement age for participants \| yr	60
Maximum
Defined Benefit Plan Disclosure [Line Items]
Payment of retirement benefits, commencement age for participants \| yr	65
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 962.6	891.3
Pension Plan \| U.S.
Defined Benefit Plan Disclosure [Line Items]
Pension and post-retirement benefit obligations	55.5	53.6
Employer contributions	$ 4.9	$ 5.6
Weighted average asset allocations	100.00%	100.00%
Pension Plan \| U.S. \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	64.00%	56.00%
Pension Plan \| U.S. \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	29.00%	33.00%
Pension Plan \| U.S. \| Alternate assets
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	7.00%