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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, 2018 | Dec. 31, 2017
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Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | $ 36.0 | $ 28.2
Gross Unrealized Losses, Less than 12 Months | (0.5) | (0.2)
Estimated Fair Value, 12 Months or More | 10.0 | 12.0
Gross Unrealized Losses, 12 Months or More | (0.2) | (0.1)
Total Estimated Fair Value | 46.0 | 40.2
Total Gross Unrealized Losses | (0.7) | (0.3)
Corporate Bond Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 18.4 | 11.1
Gross Unrealized Losses, Less than 12 Months | (0.2) | (0.1)
Estimated Fair Value, 12 Months or More | 1.4 | 1.9
Gross Unrealized Losses, 12 Months or More | (0.1) | 0.0
Total Estimated Fair Value | 19.8 | 13.0
Total Gross Unrealized Losses | (0.3) | (0.1)
US Government and Agency Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 10.8 | 11.0
Gross Unrealized Losses, Less than 12 Months | (0.2) | (0.1)
Estimated Fair Value, 12 Months or More | 6.5 | 7.9
Gross Unrealized Losses, 12 Months or More | (0.1) | (0.1)
Total Estimated Fair Value | 17.3 | 18.9
Total Gross Unrealized Losses | (0.3) | (0.2)
Asset-backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 5.7 | 4.9
Gross Unrealized Losses, Less than 12 Months | (0.1) |
Estimated Fair Value, 12 Months or More | 1.0 | 1.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 6.7 | 5.9
Total Gross Unrealized Losses | (0.1) |
Mortgage-backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 1.1 | 1.2
Estimated Fair Value, 12 Months or More | 1.1 | 1.2
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | $ 2.2 | $ 2.4

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