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Goodwill and Intangible Assets (Narrative) (Detail)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]      
Goodwill, Acquired During Period $ 105.5 $ 63.4  
Goodwill, Purchase Accounting Adjustments $ 4.0    
Number of Reporting Units | segment 7    
Intangible Assets, Net (Excluding Goodwill) $ 526.9 505.1 $ 481.8
Intangibles with indefinite useful lives 70.3 69.9  
I&S (acquisition)      
Finite-Lived Intangible Assets [Line Items]      
Goodwill, Acquired During Period 108.6    
Goodwill, Purchase Accounting Adjustments 3.1    
Cummins-Allison      
Finite-Lived Intangible Assets [Line Items]      
Goodwill, Acquired During Period   54.7  
Goodwill, Purchase Accounting Adjustments $ 4.0    
Crane Currency      
Finite-Lived Intangible Assets [Line Items]      
Goodwill, Acquired During Period   $ 8.7