v3.26.1
Segment Information (Financial Information by Reportable Segment) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Net sales $ 395.9 $ 380.3 $ 1,098.5 $ 1,048.9
Cost of sales 240.1 234.6 678.4 672.2
Gross profit 155.8 145.7 420.1 376.7
Selling, general and administrative expenses 64.0 71.0 183.5 180.6
Segment operating income 80.6 73.7 217.7 191.0
Interest expense, net 0.7 1.7 3.3 5.6
Income before income taxes 79.8 72.0 214.3 185.5
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component 0.1   0.1 (0.1)
Operating Segments        
Segment Reporting [Line Items]        
Segment operating income 101.9 90.6 276.3 238.6
Segment Reporting, Reconciling Item, Corporate Nonsegment        
Segment Reporting [Line Items]        
Selling, general and administrative expenses 16.7 16.1 46.5 44.1
Corporate strategic reorganization and other charges 4.6 0.8 12.1 3.5
Water Flow Solutions | Operating Segments        
Segment Reporting [Line Items]        
Net sales 215.3 216.6 606.6 607.4
Cost of sales 125.8 132.8 359.2 391.5
Gross profit 89.5 83.8 247.4 215.9
Selling, general and administrative expenses 23.5 23.3 66.8 65.0
Segment operating income 66.0 60.5 180.6 149.9
Corporate strategic reorganization and other charges 0.0 0.0 0.0 1.0
Water Management Solutions | Operating Segments        
Segment Reporting [Line Items]        
Net sales 180.6 163.7 491.9 441.5
Cost of sales 114.3 101.8 319.2 280.7
Gross profit 66.3 61.9 172.7 160.8
Selling, general and administrative expenses 23.8 31.6 70.2 71.5
Segment operating income 35.9 30.1 95.7 88.7
Corporate strategic reorganization and other charges $ 6.6 $ 0.2 $ 6.8 $ 0.6