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Marketable Investment Securities - Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Cash and cash equivalents:
Amortized cost	$ 110.7	$ 258.4
Estimated fair value	110.7	258.4
Total
Amortized cost	262.4	398.9
Gross unrealized holding gains	0.0	0.1
Gross unrealized holding losses	(3.2)	(0.2)
Estimated fair value	259.2	398.8
Corporate bonds and notes
Available-for-sale:
Amortized cost	82.2	105.7
Gross unrealized holding gains	0.0	0.1
Gross unrealized holding losses	(1.9)	(0.2)
Estimated fair value	80.3	105.6
Municipal bonds
Available-for-sale:
Amortized cost	23.9	16.1
Gross unrealized holding gains	0.0	0.0
Gross unrealized holding losses	(0.4)	0.0
Estimated fair value	23.5	16.1
Federal agency issues
Available-for-sale:
Amortized cost	23.8	6.8
Gross unrealized holding gains	0.0	0.0
Gross unrealized holding losses	(0.7)	0.0
Estimated fair value	23.1	6.8
U.S. government securities
Available-for-sale:
Amortized cost	21.8	11.9
Gross unrealized holding gains	0.0	0.0
Gross unrealized holding losses	(0.2)	0.0
Estimated fair value	21.6	11.9
Cash
Cash and cash equivalents:
Amortized cost	57.8	195.2
Estimated fair value	57.8	195.2
Cash equivalents
Cash and cash equivalents:
Amortized cost	52.9	63.2
Estimated fair value	$ 52.9	$ 63.2

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