Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Goodwill (Details)

v3.20.2
Summary of Significant Accounting Policies - Goodwill (Details)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
segment
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Changes in the carrying amount of goodwill            
Goodwill, Beginning Balance     $ 470.7 $ 472.5    
Acquisitions     716.4 12.4    
Divestiture     (77.9)      
Foreign currency adjustments     28.6 (14.2)    
Goodwill, Ending Balance $ 1,137.8   1,137.8 470.7 $ 472.5  
Number of Reporting Units | segment   4        
Goodwill and Intangible Asset Impairment [Abstract]            
Goodwill, impairment loss   $ 72.3        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   10.2 10.2      
Total   82.5 144.8 0.0 63.4  
TerraSource Global            
Goodwill and Intangible Asset Impairment [Abstract]            
Goodwill, impairment loss 16.9          
Total   73.0        
Trade Names            
Goodwill            
Trade names, indefinite lives 226.8   226.8 111.0    
Goodwill and Intangible Asset Impairment [Abstract]            
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   8.6        
Technology, including patents            
Goodwill and Intangible Asset Impairment [Abstract]            
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   $ 1.6        
Minimum            
Changes in the carrying amount of goodwill            
Reporting Unit, Approximate Percentage of Fair Value in Excess of Carrying Amount   3.00%        
Maximum            
Changes in the carrying amount of goodwill            
Reporting Unit, Approximate Percentage of Fair Value in Excess of Carrying Amount   16.00%        
Advanced Process Solutions            
Changes in the carrying amount of goodwill            
Goodwill, Beginning Balance     462.4 464.2    
Acquisitions     1.7 12.4    
Divestiture     0.0      
Foreign currency adjustments     21.0 (14.2)    
Goodwill, Ending Balance 485.1   485.1 462.4 464.2  
Reporting Unit, Goodwill           $ 95.2
Additional Goodwill Impairment If Fair Value Decreased 10 Percent   $ 12.0        
Goodwill and Intangible Asset Impairment [Abstract]            
Goodwill, impairment loss   72.3   58.8    
Total   73.0        
Advanced Process Solutions | Trade Names            
Changes in the carrying amount of goodwill            
Reporting Unit, Indefinite-Lived Intangible Asset, Pre-Impairment Charge           4.4
Goodwill and Intangible Asset Impairment [Abstract]            
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   0.7        
Advanced Process Solutions | Technology, including patents            
Goodwill and Intangible Asset Impairment [Abstract]            
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   0.0        
Molding Technology Solutions            
Changes in the carrying amount of goodwill            
Goodwill, Beginning Balance     0.0 0.0    
Acquisitions     714.7 0.0    
Divestiture     (77.9)      
Foreign currency adjustments     7.6 0.0    
Goodwill, Ending Balance 644.4   644.4 0.0 0.0  
Reporting Unit, Indefinite-Lived Intangible Asset, Pre-Impairment Charge           $ 125.0
Additional Indefinite-Lived Intangible Asset Impairment If Fair Value Decreased 10 Percent   12.0        
Goodwill and Intangible Asset Impairment [Abstract]            
Goodwill, impairment loss   0.0        
Total   9.5        
Molding Technology Solutions | Trade Names            
Goodwill and Intangible Asset Impairment [Abstract]            
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   7.9        
Molding Technology Solutions | Technology, including patents            
Goodwill and Intangible Asset Impairment [Abstract]            
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   $ 1.6        
Batesville            
Changes in the carrying amount of goodwill            
Goodwill, Beginning Balance     8.3 8.3    
Acquisitions     0.0 0.0    
Divestiture     0.0      
Foreign currency adjustments     0.0 0.0    
Goodwill, Ending Balance $ 8.3   $ 8.3 $ 8.3 $ 8.3