Acquisitions (Assets Acquired And Liabilities Assumed, Esselte Acquisition) (Details) - USD ($) $ in Millions	Jan. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Less fair value of assets acquired:
Goodwill		$ 670.3	$ 587.1
Esselte Acquisition
Calculation of Goodwill:
Purchase price, net of working capital adjustment	$ 326.5
Plus fair value of liabilities assumed:
Accounts payable and accrued liabilities	121.9
Deferred tax liabilities	83.6
Pension obligations	174.1
Other non-current liabilities	5.8
Fair value of liabilities assumed	385.4
Less fair value of assets acquired:
Cash acquired	34.2
Accounts receivable	60.0
Inventory	41.9
Property, plant and equipment	75.6
Identifiable intangibles	277.0
Deferred tax assets	106.3
Other assets	10.4
Fair value of assets acquired	605.4
Goodwill	$ 106.5