Goodwill and Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)		8 years 6 months	9 years 1 month 6 days
Gross Carrying Amount		$ 593.1	$ 542.9
Accumulated Amortization		$ 284.7	$ 247.0
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	[1],[2]	8 years 6 months	9 years 1 month 6 days
Gross Carrying Amount	[1],[2]	$ 551.1	$ 503.8
Accumulated Amortization	[1],[2]	$ 254.9	$ 220.2
Trademarks and Trade Names
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	[2]	8 years 4 months 24 days	9 years 3 months 18 days
Gross Carrying Amount	[2]	$ 37.6	$ 34.8
Accumulated Amortization	[2]	$ 25.5	$ 23.0
Other Intangible Assets
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	[2]	2 years 2 months 12 days	1 year 2 months 12 days
Gross Carrying Amount	[2]	$ 4.4	$ 4.3
Accumulated Amortization	[2]	$ 4.3	$ 3.8

[1] During the second quarter of 2020, the Company recorded a $4.5 million adjustment to decrease the remaining book value of the customer relationships intangible asset as a result of the closure of the San Lorenzo, California corrugated products facility.

[2] In connection with the December 2021 acquisition of Advance Packaging, the Company recorded intangible assets of $47.3 million for customer relationships, $2.8 million for trade names, and $0.1 million for other intangibles.