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Marketable Investment Securities
6 Months Ended
Jun. 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 June 30, 2022 and December 31, 2021 were as follows:
(in millions)Amortized
cost
Gross
unrealized
holding
gains
Gross
unrealized
holding
losses
Estimated
fair value
June 30, 2022
Cash and cash equivalents:
Cash$81.1 $— $— $81.1 
Cash equivalents24.1 — — 24.1 
Total cash and cash equivalents105.2 — — 105.2 
Available-for-sale:
Corporate bonds and notes96.5 — (1.5)95.0 
Municipal bonds31.1 — (0.2)30.9 
Federal agency issues21.9 — (0.4)21.5 
US government securities31.3 — (0.3)31.0 
Total$286.0 $— $(2.4)$283.6 
(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 
US 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 June 30, 2022:
(in millions)Amortized
cost
Estimated
fair value
Cash$81.1 $81.1 
Cash equivalents24.1 24.1 
Available-for-sale:
Due within one year100.5 99.9 
Due after one year through five years80.1 78.3 
Due after five years0.2 0.2 
Total$286.0 $283.6 
Additional information relating to fair value of marketable investment securities can be found in Note 4.