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Goodwill and Intangible Assets - Components of Intangible Assets (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Life (in Years) 9 years 3 months 18 days 9 years 10 months 24 days
Gross Carrying Amount $ 542.9 $ 542.9
Accumulated Amortization $ 237.5 $ 204.1
Customer Relationships    
Finite Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Life (in Years) [1] 9 years 3 months 18 days 10 years
Gross Carrying Amount [1] $ 503.8 $ 503.8
Accumulated Amortization [1] $ 211.4 $ 180.2
Trademarks and Trade Names    
Finite Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Life (in Years) 9 years 3 months 18 days 9 years 6 months
Gross Carrying Amount $ 34.8 $ 34.8
Accumulated Amortization $ 22.4 $ 20.6
Other Intangible Assets    
Finite Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Life (in Years) 1 year 4 months 24 days 2 years 1 month 6 days
Gross Carrying Amount $ 4.3 $ 4.3
Accumulated Amortization $ 3.7 $ 3.3
[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.