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Investments in Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2022
Marketable Securities [Abstract]  
Schedule of Investments in Marketable Securities
The following table summarizes the cost, gross unrealized gains, gross unrealized losses, and fair value of Investments in marketable securities:
 December 31,
2021
March 31,
2022
Cost$73.2 $81.7 
Unrealized gains8.1 5.6 
Unrealized losses(2.8)(6.2)
Fair value$78.5 $81.1