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2. Available-for-Sale Investments (Details) - USD ($) $ in Millions		Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	$ 1,344.1
Debt Securities, Available-for-sale	[1]	1,327.6
Fair Value, Recurring [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	1,327.6	$ 1,300.0
Fair Value, Recurring [Member] | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	1,344.1	1,320.6
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	0.9	0.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(17.4)	(20.9)
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0	0.0
Debt Securities, Available-for-sale	[1]	1,327.6	1,300.0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	674.2	699.3
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	682.8	709.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	0.4	0.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(9.0)	(10.8)
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0	0.0
Debt Securities, Available-for-sale	[1]	674.2	699.3
Fair Value, Recurring [Member] | Municipal obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	18.0	23.1
Fair Value, Recurring [Member] | Municipal obligations [Member] | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	18.2	23.4
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]	(0.2)	(0.3)
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0	0.0
Debt Securities, Available-for-sale	[1]	18.0	23.1
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	293.7	230.7
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member] | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	295.9	233.9
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]	(2.4)	(3.2)
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0	0.0
Debt Securities, Available-for-sale	[1]	293.7	230.7
Fair Value, Recurring [Member] | Foreign Government Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	13.6	13.5
Fair Value, Recurring [Member] | Foreign Government Obligations [Member] | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	13.8	13.8
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]	(0.2)	(0.3)
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0	0.0
Debt Securities, Available-for-sale	[1]	13.6	13.5
Fair Value, Recurring [Member] | Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	328.1	333.4
Fair Value, Recurring [Member] | Asset-backed Securities [Member] | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	333.4	339.6
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	0.3	0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(5.6)	(6.3)
Debt Securities, Available-for-sale, Allowance for Credit Loss	[1]	0.0	0.0
Debt Securities, Available-for-sale	[1]	$ 328.1	$ 333.4
[1] Available-for-sale investments are included in Short-term investments in the condensed consolidatedbalance 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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