Investments - Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2024 USD ($) shares	Sep. 30, 2024 USD ($) shares	Aug. 23, 2024 $ / shares shares	Jan. 05, 2024 $ / shares shares	Dec. 31, 2023 USD ($)	Oct. 06, 2023 $ / shares shares	Oct. 04, 2023 tranche shares
Debt and Equity Securities, FV-NI [Line Items]
Technology investments	$ 149.9	$ 149.9			$ 128.0
Long-term Investments
Debt and Equity Securities, FV-NI [Line Items]
Technology investments	144.9	144.9			124.6
Short-Term Investments
Debt and Equity Securities, FV-NI [Line Items]
Technology investments	$ 5.0	$ 5.0			$ 3.4
VOXX International Corporation
Debt and Equity Securities, FV-NI [Line Items]
Shares of investment held (in shares) | shares	6,463,808	6,463,808
Gain (loss) relating to mark to market adjustment in investment income	$ 14.9	$ (9.0)
VOXX International Corporation
Debt and Equity Securities, FV-NI [Line Items]
Number of tranches | tranche							2
VOXX International Corporation | Common Class A
Debt and Equity Securities, FV-NI [Line Items]
Number of shares acquired (in shares) | shares			3,152,500	1,568,750		1,568,750	3,137,500
Shares purchased, price per share (in dollars per share) | $ / shares			$ 5	$ 10		$ 10