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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale by Aging Catagory) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | $ 17.5 | $ 26.0
Gross Unrealized Losses, Less than 12 Months | 0 | (0.3)
Estimated Fair Value, 12 Months or More | 7.5 | 0
Gross Unrealized Losses, 12 Months or More | (0.1) | 0
Total Estimated Fair Value | 25.0 | 26.0
Total Gross Unrealized Losses | (0.1) | (0.3)
US Government and Agency Securities [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 7.4 | 11.8
Gross Unrealized Losses, Less than 12 Months | 0 | (0.2)
Estimated Fair Value, 12 Months or More | 4.4 | 0
Gross Unrealized Losses, 12 Months or More | (0.1) | 0
Total Estimated Fair Value | 11.8 | 11.8
Total Gross Unrealized Losses | (0.1) | (0.2)
Corporate Bonds [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 5.8 | 2.3
Gross Unrealized Losses, Less than 12 Months |  | (0.1)
Estimated Fair Value, 12 Months or More | 3.1 | 0
Gross Unrealized Losses, 12 Months or More | 0 | 0
Total Estimated Fair Value | 8.9 | 2.3
Total Gross Unrealized Losses |  | (0.1)
Commercial Paper [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 4.3 | 10.0
Gross Unrealized Losses, Less than 12 Months |  | 0
Estimated Fair Value, 12 Months or More | 0 | 0
Gross Unrealized Losses, 12 Months or More | 0 | 0
Total Estimated Fair Value | 4.3 | 10.0
Total Gross Unrealized Losses |  | 0
Certificates of Deposit [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Estimated Fair Value, Less than 12 Months |  | 1.9
Gross Unrealized Losses, Less than 12 Months |  |
Estimated Fair Value, 12 Months or More |  | 0
Gross Unrealized Losses, 12 Months or More |  | 0
Total Estimated Fair Value |  | 1.9
Total Gross Unrealized Losses |  |

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