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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Restricted Securities Available For Sale [Line Items]
Total restricted securities available for sale, cost	$ 68.8	$ 62.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0.0	0.5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2.8	0.4
Debt Securities, Available-for-sale, Restricted	66.0	62.1
Corporate Bond Securities [Member]
Restricted Securities Available For Sale [Line Items]
Total restricted securities available for sale, cost	28.6	27.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0.0	0.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1.5	0.2
Debt Securities, Available-for-sale, Restricted	27.1	27.4
US Government and Agency Securities [Member]
Restricted Securities Available For Sale [Line Items]
Total restricted securities available for sale, cost	26.4	21.5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0.0	0.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1.0	0.1
Debt Securities, Available-for-sale, Restricted	25.4	21.6
Asset-backed Securities [Member]
Restricted Securities Available For Sale [Line Items]
Total restricted securities available for sale, cost	11.8	12.9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0.0	0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0.3	0.1
Debt Securities, Available-for-sale, Restricted	11.5	12.8
Commercial Paper
Restricted Securities Available For Sale [Line Items]
Total restricted securities available for sale, cost	1.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0.0
Debt Securities, Available-for-sale, Restricted	1.7
Mortgage-backed Securities [Member]
Restricted Securities Available For Sale [Line Items]
Total restricted securities available for sale, cost	0.3	0.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0.0	0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0.0	0.0
Debt Securities, Available-for-sale, Restricted	$ 0.3	$ 0.3

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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