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Acquisitions (Narrative) (Details)
$ in Millions
12 Months Ended
Oct. 01, 2018
USD ($)
Feb. 01, 2018
USD ($)
Dec. 31, 2018
USD ($)
business
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]          
Business acquisition, cash paid     $ 46.9 $ 39.7 $ 23.4
Goodwill     103.4 100.2 $ 86.6
CDF          
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]          
Cash paid in acquisition, net of cash acquired   $ 35.6      
Goodwill   3.6      
Debt assumed in acquisition   $ 2.7      
Hydrapower Dynamics Limited          
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]          
Cash paid in acquisition, net of cash acquired $ 7.8        
Immaterial business acquisitions          
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]          
Cash paid in acquisition, net of cash acquired     $ 3.5    
Number of acquisitions | business     2    
Business acquisition, cash paid       39.7  
2018 Acquisitions          
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]          
Revenue since acquisition     $ 72.3    
HAT          
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]          
Intangible assets acquired     2.0    
Indefinite-lived tradenames | 2018 Acquisitions          
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]          
Intangible assets acquired     0.9    
Customer relationships | 2018 Acquisitions          
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]          
Intangible assets acquired     $ 1.5    
Customer relationships | HAT          
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]          
Intangible assets acquired       $ 4.0