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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Restricted Securities Available For Sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis		$ 68.2	$ 64.1
Gross Unrealized Gains		1.2	2.0
Gross Unrealized Losses		(0.1)	0.0
Estimated Fair Value	[1]	69.3	66.1
Corporate Bond Securities [Member]
Restricted Securities Available For Sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis		33.1	31.3
Gross Unrealized Gains		0.7	1.1
Gross Unrealized Losses		(0.1)	0.0
Estimated Fair Value		33.7	32.4
US Government and Agency Securities [Member]
Restricted Securities Available For Sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis		22.3	19.7
Gross Unrealized Gains		0.4	0.7
Gross Unrealized Losses		0.0	0.0
Estimated Fair Value		22.7	20.4
Asset-backed Securities [Member]
Restricted Securities Available For Sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis		12.4	12.7
Gross Unrealized Gains		0.1	0.2
Gross Unrealized Losses		0.0
Estimated Fair Value		12.5	12.9
Mortgage-backed Securities [Member]
Restricted Securities Available For Sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis		0.4	0.4
Gross Unrealized Gains		0.0	0.0
Gross Unrealized Losses		0.0	0.0
Estimated Fair Value		$ 0.4	$ 0.4
[1] Measured at fair value on a recurring basis.

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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The carrying amount of securities categorized neither as held-to-maturity nor trading which serve as security for borrowings or other arrangements.

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