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Segment Reporting (Schedule of Segment Reporting Information, Reconcile to Net Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting [Abstract]      
Total revenues $ 1,557.4 $ 1,493.1 $ 1,424.9
Labor and Related Expense 224.7 214.5 200.8
Share-based Payment Arrangement, Noncash Expense 61.1 59.7 58.6
Equipment Expense 45.6 42.1 40.2
Registry fee expenses 45.3 44.1 48.5
Depreciation of property and equipment 36.9 44.1 46.9
Segment Reporting, Other Segment Item, Amount 85.6 88.0 86.8
Operating Expenses 499.2 492.5 481.8
Operating income 1,058.2 1,000.6 943.1
Interest expense (75.3) (75.3) (75.3)
Nonoperating Gains (Losses) (39.0) (51.2) (12.4)
Income tax expense (236.2) (158.9) (206.4)
Net income $ 785.7 $ 817.6 $ 673.8