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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, 2021	Dec. 31, 2020
Cash and cash equivalents:
Cash and cash equivalents, Amortized cost	$ 295.2	$ 117.0
Cash and cash equivalents, Estimated fair value	295.2	117.0
Total:
Total, Amortized cost	413.4	170.9
Total, Gross unrealized holding gains	0.3	0.8
Total, Gross unrealized holding losses	(0.1)	0.0
Total, Estimated fair value	413.6	171.7
Cash
Cash and cash equivalents:
Cash and cash equivalents, Amortized cost	208.8	47.9
Cash and cash equivalents, Estimated fair value	208.8	47.9
Cash equivalents
Cash and cash equivalents:
Cash and cash equivalents, Amortized cost	86.4	69.1
Cash and cash equivalents, Estimated fair value	86.4	69.1
Corporate bonds and notes
Available-for-sale:
Available-for-sale, Amortized cost	90.7	28.8
Available-for-sale, Gross unrealized holding gains	0.2	0.5
Available-for-sale, Gross unrealized holding losses	(0.1)	0.0
Available-for-sale, Estimated fair value	90.8	29.3
Municipal bonds
Available-for-sale:
Available-for-sale, Amortized cost	19.4	9.4
Available-for-sale, Gross unrealized holding gains	0.1	0.2
Available-for-sale, Gross unrealized holding losses	0.0	0.0
Available-for-sale, Estimated fair value	19.5	9.6
Federal agency issues
Available-for-sale:
Available-for-sale, Amortized cost	2.6	4.0
Available-for-sale, Gross unrealized holding gains	0.0	0.0
Available-for-sale, Gross unrealized holding losses	0.0	0.0
Available-for-sale, Estimated fair value	2.6	4.0
US government securities
Available-for-sale:
Available-for-sale, Amortized cost	5.5	11.7
Available-for-sale, Gross unrealized holding gains	0.0	0.1
Available-for-sale, Gross unrealized holding losses	0.0	0.0
Available-for-sale, Estimated fair value	$ 5.5	$ 11.8

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