Goodwill And Identifiable Intangibles (Narrative) (Details) $ in Millions		3 Months Ended
	Jun. 30, 2018	Jun. 30, 2018 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill impairment		$ 0.0
Impairment of intangible assets		0.0
Mead Trade Name
Acquired Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets		$ 0.0
Finite-lived intangible asset, useful life	30 years
Measurement Input, Long-term Revenue Growth Rate | Mead Trade Name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, measurement input	0.015	0.015
Measurement Input, Discount Rate | Mead Trade Name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, measurement input	0.115	0.115