Acquisitions (Narrative) (Details) € in Millions, $ in Millions				3 Months Ended		6 Months Ended		12 Months Ended
		Jan. 31, 2017 USD ($)	Jan. 31, 2017 EUR (€)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jan. 31, 2017 EUR (€)	Jan. 27, 2017 USD ($)	Jan. 27, 2017 EUR (€)
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired						$ 292.6	$ 85.4
Net sales				$ 490.0	$ 410.1	849.8	688.2
Operating income	[1]			45.4	45.4	54.7	51.9
Esselte Group Holdings AB
Business Acquisition [Line Items]
Goodwill		$ 110.7
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment				1.1
Payments to Acquire Businesses, Gross		326.8	€ 302.9
Working Capital Adjustments to Purchase Price		0.3
Cash acquired		34.2
Payments to Acquire Businesses, Net of Cash Acquired		292.3
Business Acquisition, Consideration Held in Escrow		8.7	€ 8.1
Net sales				98.2		166.8
Operating income				(2.5)		2.1
Warranty and indemnity insurance policy		$ 43.2							€ 40.0
Selling, General and Administrative Expenses [Member] | Esselte Group Holdings AB
Business Acquisition [Line Items]
Transaction Related Costs				$ 1.3	$ 2.0	$ 3.4	$ 2.0	$ 9.2
Senior Secured Notes | Euro Term Loan A
Business Acquisition [Line Items]
Maximum borrowing capacity										$ 320.8	€ 300.0
Maximum | Esselte Group Holdings AB
Business Acquisition [Line Items]
Escrow period		2 years	2 years
Period of Warranty and Indemnity Policy		7 years	7 years

[1] Operating income as presented in the segment table above is defined as i) net sales; ii) less cost of products sold; iii) less advertising, selling, general and administrative expenses; iv) less amortization of intangibles; and v) less restructuring charges.