Acquisitions (Purchase Price Allocation to the Fair Value of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Aug. 02, 2019	Jul. 02, 2018	Sep. 30, 2019	Jan. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill			$ 709.7		$ 708.9
Industria Grafica Foroni Ltda
Business Acquisition [Line Items]
Purchase price, net of working capital adjustment	$ 42.1
Accounts payable and accrued liabilities	12.1
Deferred tax liabilities	5.2
Debt	7.6
Lease liabilities	4.8
Fair value of liabilities assumed	29.7
Cash acquired	0.0
Accounts receivable	17.5
Inventory	12.6
Property, plant and equipment	8.9
Identifiable intangibles	10.2
Deferred tax assets	2.2
Right of use asset, leases	4.8
Other assets	3.7
Fair value of assets acquired	59.9
Goodwill	$ 11.9
GOBA Internacional, SA de CV
Business Acquisition [Line Items]
Purchase price, net of working capital adjustment		$ 39.1
Accounts payable and accrued liabilities		10.1
Deferred tax liabilities		3.1
Other non-current liabilities		6.5
Fair value of liabilities assumed		19.7
Cash acquired		1.9
Accounts receivable		30.0
Inventory		7.1
Property, plant and equipment		0.6
Identifiable intangibles		10.3
Deferred tax assets		2.0
Other assets		4.2
Fair value of assets acquired		56.1
Goodwill		$ 2.7
Cumberland Asset Acquisition
Business Acquisition [Line Items]
Inventory				$ 2.8
Identifiable intangibles				3.2
Fair value of assets acquired				$ 6.0