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Fair Value Measurements (Details) - USD ($) $ in Millions		Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	$ 1,059.0
Debt Securities, Available-for-sale	[1]	1,063.4
Fair Value, Recurring
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	1,063.4	$ 1,097.6
Fair Value, Recurring | Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	491.5	533.6
Fair Value, Recurring | Municipal obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	9.0	9.4
Fair Value, Recurring | US Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	151.3	118.6
Fair Value, Recurring | Foreign Government Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	7.2	5.2
Fair Value, Recurring | Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	404.4	430.8
Fair Value, Recurring | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	1,059.0	1,099.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	6.7	3.5
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(2.3)	(5.6)
Debt Securities, Available-for-sale	[1]	1,063.4	1,097.6
Fair Value, Recurring | Short-term Investments [Member] | Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	488.3	533.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	3.7	2.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(0.5)	(1.6)
Debt Securities, Available-for-sale	[1]	491.5	533.6
Fair Value, Recurring | Short-term Investments [Member] | Municipal obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	9.0	9.5
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]	(0.1)	(0.1)
Debt Securities, Available-for-sale	[1]	9.0	9.4
Fair Value, Recurring | Short-term Investments [Member] | US Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	150.9	119.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	0.7	0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(0.3)	(1.0)
Debt Securities, Available-for-sale	[1]	151.3	118.6
Fair Value, Recurring | Short-term Investments [Member] | Foreign Government Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	7.2	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]	7.2	5.2
Fair Value, Recurring | Short-term Investments [Member] | Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	403.6	432.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	2.2	1.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(1.4)	(2.9)
Debt Securities, Available-for-sale	[1]	$ 404.4	$ 430.8
[1] Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets.

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