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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale by Aging Catagory) (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
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Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | $ 1.4 | $ 37.1
Gross Unrealized Losses, Less than 12 Months | 0.0 | (0.2)
Estimated Fair Value, 12 Months or More | 0.0 | 2.4
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 1.4 | 39.5
Total Gross Unrealized Losses | 0.0 | (0.2)
Corporate Bond Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months |  | 12.6
Gross Unrealized Losses, Less than 12 Months |  | (0.1)
Estimated Fair Value, 12 Months or More |  | 1.7
Gross Unrealized Losses, 12 Months or More |  | 0.0
Total Estimated Fair Value |  | 14.3
Total Gross Unrealized Losses |  | (0.1)
US Government and Agency Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 0.8 | 16.0
Gross Unrealized Losses, Less than 12 Months | 0.0 | (0.1)
Estimated Fair Value, 12 Months or More | 0.0 | 0.7
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 0.8 | 16.7
Total Gross Unrealized Losses | 0.0 | (0.1)
Asset-backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 0.3 | 5.4
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 | 0.3 | 5.4
Mortgage-backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 0.3 | 3.1
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 | $ 0.3 | $ 3.1

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