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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, 2015 | Dec. 31, 2014
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | $ 11.8 | $ 28.3
Gross Unrealized Losses, Less than 12 Months | 0.0 | (0.1)
Estimated Fair Value, 12 Months or More | 1.4 | 5.2
Gross Unrealized Losses, 12 Months or More | 0.0 | (0.1)
Total Estimated Fair Value | 13.2 | 33.5
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 | 7.3 | 15.3
Gross Unrealized Losses, Less than 12 Months | 0.0 | (0.1)
Estimated Fair Value, 12 Months or More | 0.7 | 2.7
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 8.0 | 18.0
Total Gross Unrealized Losses | 0.0 | (0.1)
US Government and Agency Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 2.0 | 9.3
Gross Unrealized Losses, Less than 12 Months |  | 0.0
Estimated Fair Value, 12 Months or More | 0.7 | 2.5
Gross Unrealized Losses, 12 Months or More | 0.0 | (0.1)
Total Estimated Fair Value | 2.7 | 11.8
Total Gross Unrealized Losses |  | (0.1)
Asset-backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 1.3 | 3.7
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 | 1.3 | $ 3.7
Mortgage-backed Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 1.2 |
Estimated Fair Value, 12 Months or More | 0.0 |
Gross Unrealized Losses, 12 Months or More | 0.0 |
Total Estimated Fair Value | $ 1.2 |

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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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