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Fair Value Measurements and Investments Available-for-Sale Investments (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	$ 1,097.6
Debt Securities, Available-for-sale, Amortized Cost	[1]	1,099.7
Fair Value, Recurring [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale		1,097.6	$ 1,136.0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	533.6	531.6
Fair Value, Recurring [Member] | Municipal Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	9.4	12.1
Fair Value, Recurring [Member] | Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	430.8	323.7
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	118.6	255.9
Fair Value, Recurring [Member] | Foreign Government Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	5.2	12.7
Short-term Investments [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	533.6	531.6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]	(1.6)	(3.3)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	[1]	2.1	0.8
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0
Debt Securities, Available-for-sale, Amortized Cost	[1]	533.1	534.1
Short-term Investments [Member] | Fair Value, Recurring [Member] | Municipal Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	9.4	12.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]	(0.1)	(0.1)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	[1]	0.0	0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0
Debt Securities, Available-for-sale, Amortized Cost	[1]	9.5	12.2
Short-term Investments [Member] | Fair Value, Recurring [Member] | Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	430.8	323.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]	(2.9)	(2.7)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	[1]	1.3	0.7
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0
Debt Securities, Available-for-sale, Amortized Cost	[1]	432.4	325.7
Short-term Investments [Member] | Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	118.6	255.9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]	(1.0)	(1.6)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	[1]	0.1	0.1
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0
Debt Securities, Available-for-sale, Amortized Cost	[1]	119.5	257.4
Short-term Investments [Member] | Fair Value, Recurring [Member] | Foreign Government Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	5.2	12.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]	0.0	(0.1)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	[1]	0.0	0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0
Debt Securities, Available-for-sale, Amortized Cost	[1]	5.2	12.8
Short-term Investments [Member] | Fair Value, Recurring [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	1,097.6	1,136.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]	(5.6)	(7.8)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	[1]	3.5	1.6
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0
Debt Securities, Available-for-sale, Amortized Cost	[1]	$ 1,099.7	$ 1,142.2
[1] Available-for-sale investments are included in Short-term investments in the consolidated balance sheets.

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