Acquisitions (Purchase Price Allocation to the Fair Value of Assets Acquired and Liabilities Assumed) (Details) - Esselte Group Holdings AB $ in Millions	Jan. 31, 2017 USD ($)
Business Acquisition [Line Items]
Purchase price, net of working capital adjustment	$ 326.5
Accounts payable and accrued liabilities	122.6
Deferred tax liabilities	81.9
Pension obligations	171.5
Other non-current liabilities	5.2
Fair value of liabilities assumed	381.2
Cash acquired	34.2
Accounts receivable	60.0
Inventory	41.9
Property, plant and equipment	78.0
Identifiable intangibles	277.0
Deferred tax assets	96.7
Other assets	10.4
Fair value of assets acquired	598.2
Goodwill	$ 109.5