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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Effective income tax rate (in percent)	21.60%	22.10%	22.50%	21.10%
Benefits that resulted from equity incentive awards	$ 25.3	$ 1.6	$ 47.8	$ 34.0
Total amount of unrecognized tax benefits relating to uncertain tax positions	57.0		57.0
Increase (decrease) in the total amount of unrecognized tax benefits relating to uncertain tax positions			11.9
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months	$ 11.3		11.3
Positions expected to be taken in current period
Income Taxes [Line Items]
Increase (decrease) in the total amount of unrecognized tax benefits relating to uncertain tax positions			7.4
Positions taken by an acquired company
Income Taxes [Line Items]
Increase (decrease) in the total amount of unrecognized tax benefits relating to uncertain tax positions			$ 5.5
Starry Group Holdings, Inc.
Income Taxes [Line Items]
Loss from mark-to-market adjustment on investment					$ 91.5
Realized loss on investment		91.5
Valuation allowance release on Starry		$ 22.7		$ 22.7

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