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3. Fair Value Measurements Available-for-Sale Investments (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	$ 1,300.0
Debt Securities, Available-for-sale, Amortized Cost	[1]	1,320.6
Fair Value, Recurring [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale		1,300.0	$ 327.7
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	699.3	182.3
Fair Value, Recurring [Member] | Municipal Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	23.1	9.0
Fair Value, Recurring [Member] | Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	333.4	87.3
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	230.7	44.3
Fair Value, Recurring [Member] | Foreign Government Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	13.5	1.0
Fair Value, Recurring [Member] | Foreign Government Debt [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]		3.8
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]	699.3	182.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]	(10.8)	(0.2)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	[1]	0.2	0.5
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0
Debt Securities, Available-for-sale, Amortized Cost	[1]	709.9	181.9
Short-term Investments [Member] | Fair Value, Recurring [Member] | Municipal Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	23.1	9.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]	(0.3)	0.0
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]	23.4	9.0
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]	333.4	87.4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]	(6.3)	(0.2)
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]	339.6	87.5
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]	230.7	44.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]	(3.2)	0.0
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]	233.9	44.3
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]	13.5	1.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]	(0.3)	0.0
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]	13.8	1.0
Short-term Investments [Member] | Fair Value, Recurring [Member] | Foreign Government Debt [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]		3.8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]		0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	[1]		0.0
Debt Securities, Available-for-sale, Amortized Cost	[1]		3.8
Short-term Investments [Member] | Fair Value, Recurring [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	1,300.0	327.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]	(20.9)	(0.4)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	[1]	0.3	0.6
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0
Debt Securities, Available-for-sale, Amortized Cost	[1]	$ 1,320.6	$ 327.5
[1] Available-for-sale investments are included in Short-term investments in the consolidated balance sheets.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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