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Segment Reporting (Schedule of Segment Reporting Information, Reconcile to Net Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting [Abstract]
Revenues	$ 402.3	$ 384.3
Labor and Related Expense	62.1	58.8
Share-based Payment Arrangement, Noncash Expense	17.5	15.1
Equipment Expense	12.0	10.9
Registry fee expenses	11.6	11.6
Depreciation of property and equipment	8.9	9.8
Segment Reporting, Other Segment Item, Amount	19.0	19.2
Operating Expenses	131.1	125.4
Operating income	271.2	258.9
Interest Expense	20.3	18.8
Nonoperating Gains (Losses)	7.5	13.9
Income tax expense from continuing operations	59.1	59.9
Net Income	$ 199.3	$ 194.1

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