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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Restricted Securities Available For Sale [Line Items]
Total restricted securities available for sale, cost	$ 116.9	$ 105.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0.4	1.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0.7	0.1
Debt Securities, Available-for-sale, Restricted	116.6	106.2
Corporate Bond Securities [Member]
Restricted Securities Available For Sale [Line Items]
Total restricted securities available for sale, cost	57.4	53.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0.3	0.9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0.2	0.1
Debt Securities, Available-for-sale, Restricted	57.5	53.9
US Government and Agency Securities [Member]
Restricted Securities Available For Sale [Line Items]
Total restricted securities available for sale, cost	42.7	30.6
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	0.5	0.0
Debt Securities, Available-for-sale, Restricted	42.2	30.8
Asset-backed Securities [Member]
Restricted Securities Available For Sale [Line Items]
Total restricted securities available for sale, cost	14.0	18.5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0.1	0.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0.0
Debt Securities, Available-for-sale, Restricted	14.1	18.7
Mortgage-backed Securities [Member]
Restricted Securities Available For Sale [Line Items]
Total restricted securities available for sale, cost	2.8	2.8
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	$ 2.8	$ 2.8

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).

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Amount, before tax, of unrealized loss 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).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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