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Acquisitions (Esselte Narrative) (Details) € in Millions, $ in Millions			12 Months Ended
	Jan. 31, 2017 USD ($)	Jan. 31, 2017 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 31, 2017 EUR (€)	Jan. 27, 2017 USD ($)	Jan. 27, 2017 EUR (€)
Business Acquisition [Line Items]
Cost of acquisitions, net of cash acquired			$ 41.3	$ 38.0	$ 292.3
Goodwill			$ 718.6	$ 708.9	670.3
Secured Debt | Euro Term Loan A
Business Acquisition [Line Items]
Debt Instrument, Face Amount							$ 320.8	€ 300.0
Esselte Acquisition
Business Acquisition [Line Items]
Payments to acquire business	$ 326.8	€ 302.9
Reduction to Purchase Price - Due to Working Capital Adjustments	(0.3)
Cash acquired	34.2
Cost of acquisitions, net of cash acquired	292.3
Warranty and indemnity insurance policy	$ 43.2					€ 40.0
Period of warranty and indemnity policy	7 years	7 years
Goodwill	$ 106.5
Esselte Acquisition | SG&A Expenses
Business Acquisition [Line Items]
Transaction costs					$ 5.0

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