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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale by Aging Catagory) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | $ 23.7 | $ 33.4
Gross Unrealized Losses, Less than 12 Months | (0.1) | (0.3)
Estimated Fair Value, 12 Months or More | 2.5 | 0.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 26.2 | 33.4
Total Gross Unrealized Losses | (0.1) | (0.3)
Corporate Bond Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 4.0 | 11.8
Gross Unrealized Losses, Less than 12 Months | 0.0 | (0.2)
Estimated Fair Value, 12 Months or More | 1.4 | 0.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 5.4 | 11.8
Total Gross Unrealized Losses | 0.0 | (0.2)
US Government and Agency Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 13.2 | 16.4
Gross Unrealized Losses, Less than 12 Months | (0.1) | (0.1)
Estimated Fair Value, 12 Months or More | 1.1 | 0.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 14.3 | 16.4
Total Gross Unrealized Losses | (0.1) | (0.1)
Asset-backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 4.2 | 2.8
Gross Unrealized Losses, Less than 12 Months | 0.0 |
Estimated Fair Value, 12 Months or More | 0.0 | 0.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 4.2 | 2.8
Mortgage-backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 2.3 | 2.4
Estimated Fair Value, 12 Months or More | 0.0 | 0.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | $ 2.3 | $ 2.4

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