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Acquisitions (Narrative) (Details) R$ in Millions, $ in Millions, $ in Millions, $ in Millions							3 Months Ended	6 Months Ended	9 Months Ended		12 Months Ended
	Aug. 02, 2019 USD ($)	Aug. 02, 2019 BRL (R$)	Jan. 31, 2019 USD ($)	Jan. 31, 2019 AUD ($)	Jul. 02, 2018 USD ($)	Jul. 02, 2018 MXN ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Cost of acquisitions, net of cash acquired									$ 42.1	$ 37.3
Goodwill							$ 709.7		709.7		$ 708.9
Industria Grafica Foroni Ltda
Business Acquisition [Line Items]
Payments to acquire business, gross	$ 42.1	R$ 159.5
Debt	7.6
Cost of acquisitions, net of cash acquired	42.1
Revenue of acquired business since acquisition date							$ 5.7		5.7
Goodwill	11.9
Business acquisition, consideration held in escrow	$ 6.6	R$ 25.0
Cumberland Asset Acquisition
Business Acquisition [Line Items]
Payments to acquire business, gross			$ 6.0	$ 8.2
GOBA Internacional, SA de CV
Business Acquisition [Line Items]
Payments to acquire business, gross					$ 39.9	$ 796.8
Cash acquired					1.9
Cost of acquisitions, net of cash acquired					37.2
Revenue of acquired business since acquisition date								$ 23.7
Goodwill					2.7
Working capital adjustments to purchase price									(0.8)
Business acquisition, consideration held in escrow					$ 5.8	$ 115.0
Selling, General and Administrative Expenses | Industria Grafica Foroni Ltda
Business Acquisition [Line Items]
Transaction related costs									1.3
Selling, General and Administrative Expenses | Cumberland Asset Acquisition
Business Acquisition [Line Items]
Transaction related costs									$ 0.1
Selling, General and Administrative Expenses | GOBA Internacional, SA de CV
Business Acquisition [Line Items]
Transaction related costs											$ 1.1
Maximum | Industria Grafica Foroni Ltda
Business Acquisition [Line Items]
Escrow period	6 years	6 years
Maximum | GOBA Internacional, SA de CV
Business Acquisition [Line Items]
Escrow period					5 years	5 years

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