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Segment Information (Financial Information by Reportable Segment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]      
Revenues $ 1,429.7 $ 1,314.7 $ 1,275.7
Cost of sales 913.0 855.7 896.2
Gross profit 516.7 459.0 379.5
Selling, general and administrative expenses 247.3 245.2 241.9
Strategic reorganization and other charges 8.8 15.8 10.2
Goodwill impairment 0.0 16.3 0.0
Operating income 260.6 181.7 127.4
Pension (benefit) expense other than service (0.2) 4.0 3.7
Interest expense, net 6.6 12.7 14.7
Other expense 0.0 1.6 0.0
Income before income taxes 254.2 163.4 109.0
Water Flow Solutions      
Segment Reporting Information [Line Items]      
Revenues 824.9 755.5 634.4
Water Management Solutions      
Segment Reporting Information [Line Items]      
Revenues 604.8 559.2 641.3
Operating Segments      
Segment Reporting Information [Line Items]      
Operating income 327.8 253.2 185.6
Operating Segments | Water Flow Solutions      
Segment Reporting Information [Line Items]      
Revenues 824.9 755.5 634.4
Cost of sales 528.6 483.6 469.5
Gross profit 296.3 271.9 164.9
Selling, general and administrative expenses 90.3 92.5 85.3
Strategic reorganization and other charges 1.0 0.2 0.0
Goodwill impairment   0.0  
Operating income 205.0 179.2 79.6
Operating Segments | Water Management Solutions      
Segment Reporting Information [Line Items]      
Revenues 604.8 559.2 641.3
Cost of sales 384.4 372.1 426.7
Gross profit 220.4 187.1 214.6
Selling, general and administrative expenses 96.9 95.0 106.9
Strategic reorganization and other charges 0.7 1.8 1.7
Goodwill impairment   16.3  
Operating income 122.8 74.0 106.0
Corporate      
Segment Reporting Information [Line Items]      
Selling, general and administrative expenses 60.1 57.7 49.7
Strategic reorganization and other charges $ 7.1 $ 13.8 $ 8.5