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Fair Value Measurements (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	$ 1,122.0
Debt Securities, Available-for-sale	[1]	1,133.3
Equity Securities, FV-NI, Unrealized Loss		(1,711.0)
Equity Securities without Readily Determinable Fair Value, Amount		8.0	$ 8.0
Equity Method Investments		26.8	32.3
Fair Value, Recurring
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	1,133.3	1,136.0
Fair Value, Recurring | Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	543.8	531.6
Fair Value, Recurring | Municipal obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	6.7	12.1
Fair Value, Recurring | US Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	147.0	255.9
Fair Value, Recurring | Foreign Government Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	2.6	12.7
Fair Value, Recurring | Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	433.2	323.7
Fair Value, Recurring | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	1,122.0	1,142.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	12.6	1.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(1.3)	(7.8)
Debt Securities, Available-for-sale	[1]	1,133.3	1,136.0
Fair Value, Recurring | Short-term Investments [Member] | Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	536.6	534.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	7.5	0.8
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(0.3)	(3.3)
Debt Securities, Available-for-sale	[1]	543.8	531.6
Fair Value, Recurring | Short-term Investments [Member] | Municipal obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	6.6	12.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	0.1	0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	0.0	(0.1)
Debt Securities, Available-for-sale	[1]	6.7	12.1
Fair Value, Recurring | Short-term Investments [Member] | US Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	145.9	257.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	1.3	0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(0.2)	(1.6)
Debt Securities, Available-for-sale	[1]	147.0	255.9
Fair Value, Recurring | Short-term Investments [Member] | Foreign Government Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	2.6	12.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	0.0	0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	0.0	(0.1)
Debt Securities, Available-for-sale	[1]	2.6	12.7
Fair Value, Recurring | Short-term Investments [Member] | Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	430.3	325.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	3.7	0.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(0.8)	(2.7)
Debt Securities, Available-for-sale	[1]	$ 433.2	$ 323.7
[1] Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets.

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