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Marketable Investment Securities
 12 Months Ended
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
MARKETABLE INVESTMENT SECURITIES MARKETABLE INVESTMENT SECURITIES
The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value debt securities classified as available-for-sale securities by major security type and class of security at December 31, 2022 and December 31, 2021 were as follows:
(in millions)Amortized
cost		Gross
unrealized
holding
gains		Gross
unrealized
holding
losses		Estimated
fair value
December 31, 2022:
Cash and cash equivalents:
Cash$53.6 $— $— $53.6 
Cash equivalents3.3 — — 3.3 
Total cash and cash equivalents56.9 — — 56.9 
Available-for-sale:
Corporate bonds and notes66.7 — (1.6)65.1 
Municipal bonds16.3 — (0.3)16.0 
Federal agency issues20.7 — (0.7)20.0 
U.S. government securities11.8 — (0.1)11.7 
Total$172.4 $— $(2.7)$169.7 
(in millions)Amortized
cost		Gross
unrealized
holding
gains		Gross
unrealized
holding
losses		Estimated
fair value
December 31, 2021:
Cash and cash equivalents:
Cash$194.2 $— $— $194.2 
Cash equivalents63.2 — — 63.2 
Total cash and cash equivalents257.4 — — 257.4 
Available-for-sale:
Corporate bonds and notes105.7 0.1 (0.2)105.6 
Municipal bonds16.1 — — 16.1 
Federal agency issues6.8 — — 6.8 
U.S. government securities11.9 — — 11.9 
Total$397.9 $0.1 $(0.2)$397.8 
Cash, cash equivalents, and maturities of debt securities classified as available-for-sale are as follows at December 31, 2022:
(in millions)Amortized
cost		Estimated
fair value
Cash$53.6 $53.6 
Cash equivalents3.3 3.3 
Available-for-sale:
Due within one year58.8 58.0 
Due after one year through five years56.7 54.8 
Due after five years— — 
Total$172.4 $169.7 
During the years ended December 31, 2022 and 2021, the transition period ended December 31, 2020, and the fiscal year ended June 30, 2020, the Company sold $28.4 million, $8.3 million, $1.6 million, and $3.4 million of investments, respectively. The amount of gross realized gains and realized losses upon sales of investments were insignificant in all periods presented. As of December 31, 2022, the Company had 118 available-for-sale debt securities in a gross unrealized loss position of $2.7 million, with a fair market value of $111.6 million. As of December 31, 2021, the Company had 100 available-for-sale debt securities in a gross unrealized loss position of $0.2 million, with a fair market value of $77.7 million. As of December 31, 2022 and December 31, 2021, the expected losses were determined to be immaterial and as such, the Company did not record an allowance for credit losses. The Company does not intend to sell these available-for-sale debt securities, and it is not more likely than not that it will be required to sell these securities prior to recovery of their amortized cost basis. Additional information relating to fair value of marketable investment securities can be found in Note 3.