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INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments in Debt Securities
Investments in debt securities at the end of each period were as follows (in millions):

 December 31, 2021December 31, 2020
Held-to-maturityAmortized CostGross Unrealized GainsGross Unrealized LossesFair ValueAmortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Bank time deposits$162.0 $— $— $162.0 $50.0 $— $— $50.0 
Available-for-sale
Bank time deposits$2.5 $— $— $2.5 $24.1 $— $— $24.1 
Commercial paper127.7 — — 127.7 — — — — 
United States government and agency securities147.4 0.6 (0.7)147.3 147.0 2.2 — 149.2 
Asset-backed securities515.2 0.3 (2.9)512.6 149.6 1.9 — 151.5 
Corporate debt securities1,397.1 2.0 (8.3)1,390.8 600.8 7.5 — 608.3 
Municipal securities2.8 — — 2.8 2.8 — — 2.8 
$2,192.7 $2.9 $(11.9)$2,183.7 $924.3 $11.6 $— $935.9 
Schedule of Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity
The cost and fair value of investments in debt securities, by contractual maturity, as of December 31, 2021 were as follows:

 Held-to-MaturityAvailable-for-Sale
 Amortized CostFair ValueAmortized CostFair Value
 (in millions)
Due in 1 year or less$162.0 $162.0 $441.3 $442.0 
Due after 1 year through 5 years— — 1,196.7 1,189.6 
Due after 5 years through 10 years— — 8.7 8.6 
Instruments not due at a single maturity date (a)
— — 546.0 543.5 
$162.0 $162.0 $2,192.7 $2,183.7 
_______________________________________
(a)     Consists of mortgage- and asset-backed securities.
Schedule of Gross Unrealized Losses and Fair Values for Investments in Unrealized Loss Position The following table presents gross unrealized losses and fair values for those investments that were in an unrealized loss position as of December 31, 2021, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in millions):
December 31, 2021
Less than 12 Months12 Months or GreaterTotal
Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
United States government and agency securities$85.1 $(0.7)$— $— $85.1 $(0.7)
Asset-backed securities433.3 (2.9)— — 433.3 (2.9)
Corporate debt securities1,114.1 (8.3)— — 1,114.1 (8.3)
$1,632.5 $(11.9)$— $— $1,632.5 $(11.9)
Schedule of Investments in Unconsolidated Affiliates in unconsolidated entities. These investments are recorded in "Long-term Investments" on the consolidated balance sheets, and are as follows:
 December 31,
 20212020
 (in millions)
Equity method investments  
Carrying value of equity method investments$8.4 $5.7 
Equity securities  
Carrying value of non-marketable equity securities84.1 29.4 
Total investments in unconsolidated entities$92.5 $35.1