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INVESTMENTS (Tables)
 6 Months Ended
Jun. 30, 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):
 June 30, 2021December 31, 2020
Held-to-maturityAmortized CostGross Unrealized GainsGross Unrealized LossesFair ValueAmortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Bank time deposits$35.0 $— $— $35.0 $50.0 $— $— $50.0 
Available-for-sale
Bank time deposits$3.0 $— $— $3.0 $24.1 $— $— $24.1 
Commercial paper13.2 — — 13.2 — — — — 
U.S. government and agency securities
141.7 1.4 (0.2)142.9 147.0 2.2 — 149.2 
Asset-backed securities211.5 1.2 (0.2)212.5 149.6 1.9 — 151.5 
Corporate debt securities767.4 5.0 (0.8)771.6 600.8 7.5 — 608.3 
Municipal securities2.8 — — 2.8 2.8 — — 2.8 
Total$1,139.6 $7.6 $(1.2)$1,146.0 $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 June 30, 2021, were as follows:
Held-to-MaturityAvailable-for-Sale
 Amortized CostFair ValueAmortized CostFair Value
 (in millions)
Due in 1 year or less$35.0 $35.0 $212.1 $213.4 
Due after 1 year through 5 years— — 663.6 667.1 
Due after 5 years through 10 years— — 10.2 10.4 
Instruments not due at a single maturity date— — 253.7 255.1 
$35.0 $35.0 $1,139.6 $1,146.0 
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
The following table presents gross unrealized losses and fair values for those investments that were in an unrealized loss position as of June 30, 2021, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in millions):

June 30, 2021
Less than 12 Months12 Months or GreaterTotal
Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
U.S. government and agency securities$38.1 $(0.2)$— $— $38.1 $(0.2)
Asset-backed securities83.4 (0.2)— — 83.4 (0.2)
Corporate debt securities260.5 (0.8)— — 260.5 (0.8)
$382.0 $(1.2)$— $— $382.0 $(1.2)
Schedule of Investments in Unconsolidated Affiliates Investments in these unconsolidated entities are recorded in "Long-term Investments" on the consolidated condensed balance sheets, and are as follows:
 June 30,
2021		December 31,
2020
 (in millions)
Equity method investments  
Carrying value of equity method investments$8.0 $5.7 
Equity securities  
Carrying value of non-marketable equity securities73.6 29.4 
Total investments in unconsolidated entities$81.6 $35.1