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Restricted Securities Available For Sale (Tables) | 12 Months Ended
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Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Schedule Of Restricted Securities Available For Sale | Restricted securities available for sale consist of the following:
(In millions) | As of December 31, 2014
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
U.S. Government and agency securities | $ | 28.8 |  |  | $ | 0.1 |  |  | $ | (0.1 | ) |  | $ | 28.8 |
Corporate bonds | 19.1 |  |  | — |  |  | (0.1 | ) |  | 19.0 |
Asset-backed securities | 4.8 |  |  | — |  |  | — |  |  | 4.8 |
Mortgage-backed securities | 0.6 |  |  | — |  |  | — |  |  | 0.6 |
Total restricted securities available for sale | $ | 53.3 |  |  | $ | 0.1 |  |  | $ | (0.2 | ) |  | $ | 53.2 |
(In millions) | As of December 31, 2013
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Commercial paper | $ | 23.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 23.9 |
U.S. Government and agency securities | 22.3 |  |  | — |  |  | (0.2 | ) |  | 22.1 |
Certificates of deposit | 4.6 |  |  | — |  |  | — |  |  | 4.6 |
Corporate bonds | 3.1 |  |  | — |  |  | (0.1 | ) |  | 3.0 |
Total restricted securities available for sale | $ | 53.9 |  |  | $ | — |  |  | $ | (0.3 | ) |  | $ | 53.6 |
Schedule Of Restricted Securities Available For Sale By Aging Catagory | The fair value and gross unrealized losses for restricted securities available for sale, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, are as follows:
(In millions) | Securities Available for Sale with Gross Unrealized Losses as of December 31, 2014
| Less than 12 Months |  | 12 Months or More |  |  |  |
| Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Total Estimated Fair Value |  | Total Gross Unrealized Losses
Corporate bonds | $ | 15.3 |  |  | $ | (0.1 | ) |  | $ | 2.7 |  |  | $ | — |  |  | $ | 18.0 |  |  | $ | (0.1 | )
U.S. Government and agency securities | 9.3 |  |  | — |  |  | 2.5 |  |  | (0.1 | ) |  | 11.8 |  |  | (0.1 | )
Asset-backed securities | 3.7 |  |  | — |  |  | — |  |  | — |  |  | 3.7 |  |  | — |
Total restricted securities available for sale | $ | 28.3 |  |  | $ | (0.1 | ) |  | $ | 5.2 |  |  | $ | (0.1 | ) |  | $ | 33.5 |  |  | $ | (0.2 | )
(In millions) | Securities Available for Sale with Gross Unrealized Losses as of December 31, 2013
| Less than 12 Months |  | 12 Months or More |  |  |  |
| Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Total Estimated Fair Value |  | Total Gross Unrealized Losses
Commercial paper | $ | 10.0 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 10.0 |  |  | $ | — |
U.S. Government and agency securities | 11.8 |  |  | (0.2 | ) |  | — |  |  | — |  |  | 11.8 |  |  | (0.2 | )
Certificates of deposit | 1.9 |  |  | — |  |  | — |  |  | — |  |  | 1.9 |  |  | — |
Corporate bonds | 2.3 |  |  | (0.1 | ) |  | — |  |  | — |  |  | 2.3 |  |  | (0.1 | )
Total restricted securities available for sale | $ | 26.0 |  |  | $ | (0.3 | ) |  | $ | — |  |  | $ | — |  |  | $ | 26.0 |  |  | $ | (0.3 | )
Schedule Of Cost And Estimated Fair Values Of Debt Securities By Contractual Maturity | The cost and estimated fair values of debt securities by contractual maturity were as follows (securities with multiple maturity dates are classified in the period of final maturity). Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
(In millions) | As of December 31,
| 2014 |  | 2013
| Cost |  | Estimated Fair Value |  | Cost |  | Estimated Fair Value
Contractual Maturity |  |  |  |  |  |  |
Within one year | $ | 3.8 |  |  | $ | 3.8 |  |  | $ | 41.6 |  |  | $ | 41.6 |
Over one year to five years | 45.1 |  |  | 45.0 |  |  | 7.8 |  |  | 7.8 |
Over five years to ten years | 4.1 |  |  | 4.1 |  |  | 4.5 |  |  | 4.2 |
Over ten years | 0.3 |  |  | 0.3 |  |  | — |  |  | — |
Total restricted securities available for sale | $ | 53.3 |  |  | $ | 53.2 |  |  | $ | 53.9 |  |  | $ | 53.6 |

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