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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale by Aging Catagory) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Restricted Securities Available For Sale [Line Items]
Estimated Fair Value, Less than 12 Months	$ 3.0	$ 18.9
Gross Unrealized Losses, Less than 12 Months	0.0	(0.1)
Estimated Fair Value, 12 Months or More	20.3	21.7
Gross Unrealized Losses, 12 Months or More	(0.2)	(0.4)
Total Estimated Fair Value	23.3	40.6
Total Gross Unrealized Losses	(0.2)	(0.5)
Corporate Bond Securities [Member]
Restricted Securities Available For Sale [Line Items]
Estimated Fair Value, Less than 12 Months	1.2	12.0
Gross Unrealized Losses, Less than 12 Months	0.0	(0.1)
Estimated Fair Value, 12 Months or More	7.0	6.5
Gross Unrealized Losses, 12 Months or More	(0.1)	(0.1)
Total Estimated Fair Value	8.2	18.5
Total Gross Unrealized Losses	(0.1)	(0.2)
US Government and Agency Securities [Member]
Restricted Securities Available For Sale [Line Items]
Estimated Fair Value, Less than 12 Months	0.8	2.2
Gross Unrealized Losses, Less than 12 Months	0.0	0.0
Estimated Fair Value, 12 Months or More	9.2	10.5
Gross Unrealized Losses, 12 Months or More	(0.1)	(0.2)
Total Estimated Fair Value	10.0	12.7
Total Gross Unrealized Losses	(0.1)	(0.2)
Asset-backed Securities [Member]
Restricted Securities Available For Sale [Line Items]
Estimated Fair Value, Less than 12 Months	1.0	4.7
Gross Unrealized Losses, Less than 12 Months	0.0
Estimated Fair Value, 12 Months or More	3.6	3.3
Gross Unrealized Losses, 12 Months or More	0.0	(0.1)
Total Estimated Fair Value	4.6	8.0
Total Gross Unrealized Losses		(0.1)
Mortgage-backed Securities [Member]
Restricted Securities Available For Sale [Line Items]
Estimated Fair Value, Less than 12 Months	0.0	0.0
Estimated Fair Value, 12 Months or More	0.5	1.4
Gross Unrealized Losses, 12 Months or More	0.0	0.0
Total Estimated Fair Value	$ 0.5	$ 1.4

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

No definition available.

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

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- Definition

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+ References

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- Definition

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