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Segment Reporting (Schedule of Segment Reporting Information, Reconcile to Net Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting [Abstract]        
Revenues $ 409.9 $ 387.1 $ 812.2 $ 771.4
Labor and Related Expense 61.1 55.0 123.2 113.8
Share-based Payment Arrangement, Noncash Expense 15.9 14.3 33.4 29.4
Equipment Expense 12.5 11.1 24.5 22.0
Registry fee expenses 11.8 11.0 23.4 22.5
Depreciation of property and equipment 8.3 9.3 17.2 19.1
Segment Reporting, Other Segment Item, Amount 19.6 20.2 38.6 39.5
Operating Expenses 129.2 120.9 260.3 246.3
Operating income 280.7 266.2 551.9 525.1
Interest Expense 18.9 18.8 39.2 37.6
Nonoperating Gains (Losses) 5.5 11.5 13.0 25.4
Income tax expense from continuing operations 59.9 60.1 119.0 120.0
Net Income $ 207.4 $ 198.8 $ 406.7 $ 392.9