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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) (Details) - USD ($) $ in Millions		Jun. 30, 2019	Dec. 31, 2018
Restricted Securities Available For Sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis		$ 60.5	$ 59.0
Gross Unrealized Gains		1.0	0.1
Gross Unrealized Losses		0.0	(0.5)
Estimated Fair Value	[1]	61.5	58.6
Corporate Bond Securities [Member]
Restricted Securities Available For Sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis		25.0	23.4
Gross Unrealized Gains		0.5	0.0
Gross Unrealized Losses		0.0	(0.2)
Estimated Fair Value		25.5	23.2
US Government and Agency Securities [Member]
Restricted Securities Available For Sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis		23.5	24.8
Gross Unrealized Gains		0.4	0.1
Gross Unrealized Losses		0.0	(0.2)
Estimated Fair Value		23.9	24.7
Asset-backed Securities [Member]
Restricted Securities Available For Sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis		11.1	9.4
Gross Unrealized Gains		0.1	0.0
Gross Unrealized Losses		0.0	(0.1)
Estimated Fair Value		11.2	9.3
Mortgage-backed Securities [Member]
Restricted Securities Available For Sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis		0.9	1.4
Gross Unrealized Gains		0.0	0.0
Gross Unrealized Losses		0.0	0.0
Estimated Fair Value		$ 0.9	$ 1.4
[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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