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Fair Value Measurements (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	$ 1,141.4	$ 1,141.4
Debt Securities, Available-for-sale	[1]	1,135.6	1,135.6
Equity Securities, FV-NI, Unrealized Loss		(2,874.4)	(2,472.1)
Equity Securities without Readily Determinable Fair Value, Amount		6.5	6.5	$ 6.5
Equity Method Investments		33.9	33.9	32.3
Fair Value, Recurring
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	1,135.6	1,135.6	1,136.0
Fair Value, Recurring | Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	545.0	545.0	531.6
Fair Value, Recurring | Municipal obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	8.3	8.3	12.1
Fair Value, Recurring | US Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	246.1	246.1	255.9
Fair Value, Recurring | Foreign Government Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	2.6	2.6	12.7
Fair Value, Recurring | Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	[1]	333.6	333.6	323.7
Fair Value, Recurring | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	1,141.4	1,141.4	1,142.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	1.3	1.3	1.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(7.1)	(7.1)	(7.8)
Debt Securities, Available-for-sale	[1]	1,135.6	1,135.6	1,136.0
Fair Value, Recurring | Short-term Investments [Member] | Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	547.3	547.3	534.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	0.7	0.7	0.8
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(3.0)	(3.0)	(3.3)
Debt Securities, Available-for-sale	[1]	545.0	545.0	531.6
Fair Value, Recurring | Short-term Investments [Member] | Municipal obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	8.3	8.3	12.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	0.0	0.0	0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	0.0	0.0	(0.1)
Debt Securities, Available-for-sale	[1]	8.3	8.3	12.1
Fair Value, Recurring | Short-term Investments [Member] | US Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	248.1	248.1	257.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	0.1	0.1	0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(2.1)	(2.1)	(1.6)
Debt Securities, Available-for-sale	[1]	246.1	246.1	255.9
Fair Value, Recurring | Short-term Investments [Member] | Foreign Government Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	2.6	2.6	12.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	0.0	0.0	0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	0.0	0.0	(0.1)
Debt Securities, Available-for-sale	[1]	2.6	2.6	12.7
Fair Value, Recurring | Short-term Investments [Member] | Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	335.1	335.1	325.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	[1]	0.5	0.5	0.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	[1]	(2.0)	(2.0)	(2.7)
Debt Securities, Available-for-sale	[1]	$ 333.6	$ 333.6	$ 323.7
[1] Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets.

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