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Business Combinations - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 01, 2020
USD ($)
May 31, 2020
USD ($)
Feb. 29, 2020
USD ($)
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
May 31, 2018
USD ($)
period
Business Acquisition [Line Items]                  
Purchase price, net           $ 1,342.7 $ 119.6    
Proceeds from senior notes offering   $ 640.5              
Goodwill       $ 1,280.0   1,280.0   $ 685.7  
Payment for earnout period liability           50.8 0.0    
Increase to contingent liabilities       1.5   2.5      
Underwritten Public Offering                  
Business Acquisition [Line Items]                  
Proceeds from issuance of common shares     $ 496.1            
Clariant MB                  
Business Acquisition [Line Items]                  
Purchase price, net $ 1,300.0                
Net debt and working capital adjustments $ 44.0                
Goodwill       570.1   570.1      
Revenue since acquisition date       264.2          
Income from continuing operations since acquisition date       18.3          
Acquisition costs       3.5   15.1      
Clariant MB | Expense adjustment                  
Business Acquisition [Line Items]                  
Pro forma adjustments           7.5 $ 10.0    
Clariant MB | Inventory adjustment                  
Business Acquisition [Line Items]                  
Pro forma adjustments       10.5   10.5      
Clariant MB | Interest expense, net                  
Business Acquisition [Line Items]                  
Pro forma adjustments       $ 9.6   $ 10.1      
Clariant MB | Minimum                  
Business Acquisition [Line Items]                  
Intangible asset, weighted average lives (years)       18 years          
Clariant MB | Maximum                  
Business Acquisition [Line Items]                  
Intangible asset, weighted average lives (years)       20 years          
PlastiComp                  
Business Acquisition [Line Items]                  
Earn-out ceiling                 $ 35.0
Fiber-Line                  
Business Acquisition [Line Items]                  
Number of earn-out periods | period                 2
Payment for earnout period liability         $ 53.9