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Restricted Securities Available For Sale
 9 Months Ended
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Restricted Securities Available for Sale
Restricted securities available for sale consist of the following:
(In millions)As of September 30, 2022
 Amortized CostGross Unrealized
Gains		Gross Unrealized
Losses		Estimated Fair
Value
Corporate bonds$30.0 $— $(2.2)$27.8 
U.S. Government and agency securities27.2 — (1.8)25.4 
Asset-backed securities13.1 — (0.4)12.7 
Commercial paper1.8 — — 1.8 
Mortgage-backed securities0.3 — — 0.3 
Total restricted securities available for sale$72.4 $— $(4.4)$68.0 
(In millions)As of December 31, 2021
 Amortized CostGross Unrealized
Gains		Gross Unrealized
Losses		Estimated Fair
Value
Corporate bonds$27.3 $0.3 $(0.2)$27.4 
U.S. Government and agency securities21.5 0.2 (0.1)21.6 
Asset-backed securities12.9 — (0.1)12.8 
Mortgage-backed securities0.3 — — 0.3 
Total restricted securities available for sale$62.0 $0.5 $(0.4)$62.1 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
The fair value and gross unrealized losses for restricted securities available for sale, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, are as follows:
(In millions)Securities Available for Sale with Gross Unrealized Losses as of September 30, 2022
 Less than 12 Months12 Months or More  
 Estimated
Fair Value		Gross
Unrealized
Losses		Estimated
Fair Value		Gross
Unrealized
Losses		Total
Estimated
Fair Value		Total
Gross
Unrealized
Losses
Corporate bonds$23.5 $(1.6)$4.3 $(0.6)$27.8 $(2.2)
U.S. Government and agency securities25.4 (1.8)— — 25.4 (1.8)
Asset-backed securities
11.6 (0.3)1.1 (0.1)12.7 (0.4)
Mortgage-backed securities0.3 — — — 0.3 — 
Total restricted securities available for sale
$60.8 $(3.7)$5.4 $(0.7)$66.2 $(4.4)

(In millions)Securities Available for Sale with Gross Unrealized Losses as of December 31, 2021
 Less than 12 Months12 Months or More  
 Estimated
Fair Value		Gross
Unrealized
Losses		Estimated
Fair Value		Gross
Unrealized
Losses		Total
Estimated
Fair Value		Total
Gross
Unrealized
Losses
Corporate bonds$15.0 $(0.2)$1.3 $— $16.3 $(0.2)
U.S. Government and agency securities10.1 (0.1)— — 10.1 (0.1)
Asset-backed securities8.4 (0.1)— — 8.4 (0.1)
Mortgage-backed securities— — — — — — 
Total restricted securities available for sale
$33.5 $(0.4)$1.3 $— $34.8 $(0.4)
Schedule of Cost and Estimated Fair Values of Debt Securities by Contractual Maturity The cost and estimated fair values of debt securities by contractual maturity were as follows (securities with multiple maturity dates are classified in the period of final maturity). Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
(In millions)As of
 September 30, 2022December 31, 2021
Contractual MaturityAmortized CostEstimated Fair
Value		Amortized CostEstimated Fair
Value
Within one year$5.3 $5.2 $2.9 $3.0 
Over one year to five years60.5 56.6 56.9 57.0 
Over five years to ten years6.5 6.1 2.1 2.0 
Over ten years0.1 0.1 0.1 0.1 
Total restricted securities available for sale
$72.4 $68.0 $62.0 $62.1