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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	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2020
Cash and cash equivalents:
Amortized cost	$ 56.9	$ 257.4	$ 117.0	$ 163.7
Estimated fair value	56.9	257.4
Total:
Amortized cost	172.4	397.9
Gross unrealized holding gains	0.0	0.1
Gross unrealized holding losses	(2.7)	(0.2)
Estimated fair value	169.7	397.8
Corporate bonds and notes
Available-for-sale:
Amortized cost	66.7	105.7
Gross unrealized holding gains	0.0	0.1
Gross unrealized holding losses	(1.6)	(0.2)
Estimated fair value	65.1	105.6
Municipal bonds
Available-for-sale:
Amortized cost	16.3	16.1
Gross unrealized holding gains	0.0	0.0
Gross unrealized holding losses	(0.3)	0.0
Estimated fair value	16.0	16.1
Federal agency issues
Available-for-sale:
Amortized cost	20.7	6.8
Gross unrealized holding gains	0.0	0.0
Gross unrealized holding losses	(0.7)	0.0
Estimated fair value	20.0	6.8
U.S. government securities
Available-for-sale:
Amortized cost	11.8	11.9
Gross unrealized holding gains	0.0	0.0
Gross unrealized holding losses	(0.1)	0.0
Estimated fair value	11.7	11.9
Cash
Cash and cash equivalents:
Amortized cost	53.6	194.2
Estimated fair value	53.6	194.2
Cash equivalents
Cash and cash equivalents:
Amortized cost	3.3	63.2
Estimated fair value	$ 3.3	$ 63.2

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