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Marketable Investment Securities
9 Months Ended
Sep. 30, 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 for available-for-sale securities by major security type and class of security at September 30, 2022 and December 31, 2021 were as follows:
(in millions)Amortized
cost
Gross
unrealized
holding
gains
Gross
unrealized
holding
losses
Estimated
fair value
September 30, 2022
Cash and cash equivalents:
Cash$57.8 $— $— $57.8 
Cash equivalents52.9 — — 52.9 
Total cash and cash equivalents110.7 — — 110.7 
Available-for-sale:
Corporate bonds and notes82.2 — (1.9)80.3 
Municipal bonds23.9 — (0.4)23.5 
Federal agency issues23.8 — (0.7)23.1 
U.S. government securities21.8 — (0.2)21.6 
Total$262.4 $— $(3.2)$259.2 
(in millions)Amortized
cost
Gross
unrealized
holding
gains
Gross
unrealized
holding
losses
Estimated
fair value
December 31, 2021
Cash and cash equivalents:
Cash$195.2 $— $— $195.2 
Cash equivalents63.2 — — 63.2 
Total cash and cash equivalents258.4 — — 258.4 
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$398.9 $0.1 $(0.2)$398.8 
Cash, cash equivalents, and maturities of debt securities classified as available-for-sale securities were as follows at September 30, 2022:
(in millions)Amortized
cost
Estimated
fair value
Cash$57.8 $57.8 
Cash equivalents52.9 52.9 
Available-for-sale:
Due within one year83.4 82.5 
Due after one year through five years68.3 66.0 
Due after five years— — 
Total$262.4 $259.2 
Additional information relating to fair value of marketable investment securities can be found in Note 4.