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Fair Value Measurements (Details) - USD ($) $ in Millions		Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	$ 913.9
Debt Securities, Available-for-sale	[1]	920.3
Fair Value, Recurring
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	920.3	$ 1,097.6
Fair Value, Recurring | Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	439.4	533.6
Fair Value, Recurring | Municipal obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	13.6	9.4
Fair Value, Recurring | US Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	91.6	118.6
Fair Value, Recurring | Foreign Government Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	8.4	5.2
Fair Value, Recurring | Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	367.3	430.8
Fair Value, Recurring | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	913.9	1,099.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	7.8	3.5
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(1.4)	(5.6)
Debt Securities, Available-for-sale	[1]	920.3	1,097.6
Fair Value, Recurring | Short-term Investments [Member] | Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	434.9	533.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	4.6	2.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(0.1)	(1.6)
Debt Securities, Available-for-sale	[1]	439.4	533.6
Fair Value, Recurring | Short-term Investments [Member] | Municipal obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	13.4	9.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	0.2	0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	0.0	(0.1)
Debt Securities, Available-for-sale	[1]	13.6	9.4
Fair Value, Recurring | Short-term Investments [Member] | US Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	91.1	119.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	0.6	0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(0.1)	(1.0)
Debt Securities, Available-for-sale	[1]	91.6	118.6
Fair Value, Recurring | Short-term Investments [Member] | Foreign Government Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	8.4	5.2
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	0.0
Debt Securities, Available-for-sale	[1]	8.4	5.2
Fair Value, Recurring | Short-term Investments [Member] | Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	366.1	432.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	2.4	1.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(1.2)	(2.9)
Debt Securities, Available-for-sale	[1]	$ 367.3	$ 430.8
[1] Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets.

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