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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	Jun. 30, 2022	Dec. 31, 2021
Cash and cash equivalents:
Amortized cost	$ 105.2	$ 258.4
Estimated fair value	105.2	258.4
Total
Amortized cost	286.0	398.9
Gross unrealized holding gains	0.0	0.1
Gross unrealized holding losses	(2.4)	(0.2)
Estimated fair value	283.6	398.8
Corporate bonds and notes
Available-for-sale:
Amortized cost	96.5	105.7
Gross unrealized holding gains	0.0	0.1
Gross unrealized holding losses	(1.5)	(0.2)
Estimated fair value	95.0	105.6
Municipal bonds
Available-for-sale:
Amortized cost	31.1	16.1
Gross unrealized holding gains	0.0	0.0
Gross unrealized holding losses	(0.2)	0.0
Estimated fair value	30.9	16.1
Federal agency issues
Available-for-sale:
Amortized cost	21.9	6.8
Gross unrealized holding gains	0.0	0.0
Gross unrealized holding losses	(0.4)	0.0
Estimated fair value	21.5	6.8
US government securities
Available-for-sale:
Amortized cost	31.3	11.9
Gross unrealized holding gains	0.0	0.0
Gross unrealized holding losses	(0.3)	0.0
Estimated fair value	31.0	11.9
Cash
Cash and cash equivalents:
Amortized cost	81.1	195.2
Estimated fair value	81.1	195.2
Cash equivalents
Cash and cash equivalents:
Amortized cost	24.1	63.2
Estimated fair value	$ 24.1	$ 63.2

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