Depreciation and Amortization - Schedule of Estimated Amortization Expense (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Amortization
2025 (remaining three months)	$ 99.8
2026	348.4
2027	271.5
2028	227.0
2029	190.8
Thereafter	1,878.0
Total	3,015.5
Amortization of Acquired Intangible Assets
2025 (remaining three months)	75.5
2026	264.9
2027	209.6
2028	196.9
2029	186.7
Thereafter	1,878.0
Total	2,811.6
Residual Commission Buyouts
Amortization
2025 (remaining three months)	22.9
2026	59.1
2027	10.7
2028	9.1
2029	4.0
Thereafter	2.0
Total	107.8	$ 157.2
Other Intangible Assets
Amortization
2025 (remaining three months)	68.1
2026	259.6
2027	237.5
2028	203.6
2029	182.7
Thereafter	1,876.0
Total	2,827.5	758.4
Capitalized Customer Acquisition Costs
Amortization
2025 (remaining three months)	8.8
2026	29.7
2027	23.3
2028	14.3
2029	4.1
Thereafter	0.0
Total	$ 80.2	$ 65.3

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