v3.26.1
Segment Reporting (Schedule of Segment Reporting Information, Reconcile to Net Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Abstract]        
Revenues $ 434.6 $ 409.9 $ 863.5 $ 812.2
Labor and Related Expense 65.2 61.1 130.1 123.2
Stock-based compensation 19.4 15.9 38.5 33.4
Equipment Expense 14.3 12.5 28.1 24.5
Registry fee expenses 11.8 11.8 23.4 23.4
Depreciation of property and equipment 6.6 8.3 13.0 17.2
Segment Reporting, Other Segment Item, Amount 21.0 19.6 40.5 38.6
Operating Expenses 138.3 129.2 273.6 260.3
Operating income 296.3 280.7 589.9 551.9
Interest Expense 19.2 18.9 38.1 39.2
Nonoperating Gains (Losses) 4.5 5.5 9.2 13.0
Income tax expense from continuing operations 65.1 59.9 130.0 119.0
Net Income $ 216.5 $ 207.4 $ 431.0 $ 406.7