Goodwill And Identifiable Intangibles (Acquired Finite-Lived Intangibles) (Details) - Esselte Group Holdings AB - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Jan. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite lived intangible assets		$ 277.0
Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining Useful Life Ranges	10 years
Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining Useful Life Ranges	30 years
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite lived intangible assets		53.2
Trade Names | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining Useful Life Ranges	15 years
Trade Names | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining Useful Life Ranges	30 years
Customer and contractual relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite lived intangible assets		102.4
Remaining Useful Life Ranges	15 years
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite lived intangible assets		4.6
Remaining Useful Life Ranges	10 years
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite lived intangible assets		$ 116.8