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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Acquisitions - Acquisitions Narrative (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended					6 Months Ended
	Aug. 01, 2019	Jul. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2020
Business Acquisition [Line Items]
Goodwill			$ 2,196.4		$ 2,216.9			$ 2,196.4
Protective
Business Acquisition [Line Items]
Goodwill			1,676.3		1,689.0			1,676.3
Automated Packaging Systems \| Subsequent Event
Business Acquisition [Line Items]
Taxes paid for second quarter 2020		$ 2.5
Automated Packaging Systems \| Protective
Business Acquisition [Line Items]
Percentage of shares acquired	100.00%
Consideration transferred	$ 441.4
Liabilities assumed related to deferred incentive compensation plan	58.2
Deferred compensation paid			16.5		$ 19.7
Acquisition related costs								0.3
Adjustment to consideration transferred				$ (4.3)
Goodwill	$ 261.3		$ 246.8					$ 246.8
Other 2019 Acquisitions
Business Acquisition [Line Items]
Purchase price							$ 23.4
Goodwill							$ 6.0
Goodwill increase						$ 0.3