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Debt Securities
 9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Debt Securities Debt Securities
The following table summarizes the amortized cost, unrealized gain and loss recognized in accumulated other comprehensive income (loss), and fair value of debt securities available-for-sale, aggregated by major security type and contractual maturity.
September 30,
2021		December 31,
2020
(in millions)Contractual
Maturity		Amortized
Cost
Unrealized Gain
Unrealized Loss		Fair
Value		Amortized
Cost		Unrealized GainUnrealized LossFair
Value
Commercial paper0 to 1 years$208.6 $— $— $208.6 $82.2 $— $— $82.2 
Corporate debt securities0 to 1 years170.6 0.2 — 170.8 299.3 1.4 — 300.7 
Securities of government-sponsored entities0 to 1 years75.4 — — 75.4 230.9 0.1 — 231.0 
$454.6 $0.2 $— $454.8 $612.4 $1.5 $— $613.9 
Corporate debt securities1 to 2 years$328.6 $0.2 $(0.3)$328.5 $144.8 $0.4 $— $145.2 
Securities of government-sponsored entities1 to 2 years185.2 0.1 (0.1)185.2 81.9 0.1 (0.1)81.9 
$513.8 $0.3 $(0.4)$513.7 $226.7 $0.5 $(0.1)$227.1 
As of September 30, 2021, our security portfolio consisted of 160 securities related to investments in debt securities available-for-sale, of which 82 securities were in an unrealized loss position.
Our investments in corporate debt securities in an unrealized loss position as of September 30, 2021 are of high credit quality (rated A or higher). Unrealized losses on these investments were primarily due to changes in interest rates. We do not intend to sell these investments and it is not more likely than not that we will be required to sell these investments before recovery of
their amortized cost basis. We did not recognize an allowance for credit losses as of September 30, 2021 or December 31, 2020.
The following table summarizes debt securities available-for-sale in an unrealized loss position for less than 12 months, aggregated by major security type. There were no debt securities available-for-sale in an unrealized loss position for longer than 12 months as of September 30, 2021 or December 31, 2020.
September 30,
2021		December 31,
2020
(in millions)Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Corporate Debt Securities$298.5 $(0.3)$— $— 
Securities of government-sponsored entities107.3 (0.1)95.0 (0.1)
$405.8 $(0.4)$95.0 $(0.1)
Accrued interest receivables on debt securities available-for-sale totaled $2.8 million and $3.7 million as of September 30, 2021 and December 31, 2020, respectively. We do not measure an allowance for credit losses for accrued interest receivables. For the purposes of identifying and measuring an impairment, accrued interest is excluded from both the fair value and amortized cost basis of the debt security. Uncollectible accrued interest receivables associated with an impaired debt security are reversed against interest income upon identification of the impairment. No accrued interest receivables were written off during the nine months ended September 30, 2021 or 2020.