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Segment Information (Revenue and Long-Lived Assets by Geographical Areas) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net $ 335.7 $ 318.8  
Revenues 1,429.7 1,314.7 $ 1,275.7
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 318.9 302.8  
Israel      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 12.8 11.9  
Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 4.0 4.1  
Water Flow Solutions      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 824.9 755.5 634.4
Water Flow Solutions | United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 769.3 703.1 585.9
Water Flow Solutions | Central      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 227.7 196.8 176.0
Water Flow Solutions | Northeast      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 148.9 139.2 130.6
Water Flow Solutions | Southeast      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 189.2 181.6 118.4
Water Flow Solutions | West      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 203.5 185.5 160.9
Water Flow Solutions | Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 44.0 42.2 36.2
Water Flow Solutions | Other international locations      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 11.6 10.2 12.3
Water Management Solutions      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 604.8 559.2 641.3
Water Management Solutions | United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 544.5 505.7 576.8
Water Management Solutions | Central      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 161.4 149.4 169.2
Water Management Solutions | Northeast      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 122.7 120.3 151.2
Water Management Solutions | Southeast      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 136.0 132.4 137.4
Water Management Solutions | West      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 124.4 103.6 119.0
Water Management Solutions | Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 33.6 33.3 38.3
Water Management Solutions | Other international locations      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 26.7 $ 20.2 $ 26.2