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Restricted Securities Available For Sale (Tables) | 9 Months Ended
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Sep. 30, 2018
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 September 30, 2018
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Corporate bonds | $ | 23.5 |  |  | $ | — |  |  | $ | (0.3 | ) |  | $ | 23.2 |
U.S. Government and agency securities | 22.0 |  |  | — |  |  | (0.4 | ) |  | 21.6 |
Asset-backed securities | 9.7 |  |  | — |  |  | (0.1 | ) |  | 9.6 |
Mortgage-backed securities | 1.4 |  |  | — |  |  | — |  |  | 1.4 |
Commercial paper | 0.9 |  |  | — |  |  | — |  |  | 0.9 |
Total restricted securities available for sale | $ | 57.5 |  |  | $ | — |  |  | $ | (0.8 | ) |  | $ | 56.7 |
(In millions) | As of December 31, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Corporate bonds | $ | 18.2 |  |  | $ | — |  |  | $ | (0.1 | ) |  | $ | 18.1 |
U.S. Government and agency securities | 19.2 |  |  | — |  |  | (0.2 | ) |  | 19.0 |
Asset-backed securities | 6.6 |  |  | — |  |  | — |  |  | 6.6 |
Mortgage-backed securities | 2.4 |  |  | — |  |  | — |  |  | 2.4 |
Total restricted securities available for sale | $ | 46.4 |  |  | $ | — |  |  | $ | (0.3 | ) |  | $ | 46.1 |
Schedule of Restricted Securities Available for Sale by Aging Category | 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 September 30, 2018
| 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 | $ | 19.6 |  |  | $ | (0.3 | ) |  | $ | 1.2 |  |  | $ | — |  |  | $ | 20.8 |  |  | $ | (0.3 | )
U.S. Government and agency securities | 14.6 |  |  | (0.2 | ) |  | 7.0 |  |  | (0.2 | ) |  | 21.6 |  |  | (0.4 | )
Asset-backed securities | 7.0 |  |  | (0.1 | ) |  | 2.1 |  |  | — |  |  | 9.1 |  |  | (0.1 | )
Mortgage-backed securities | 0.3 |  |  | — |  |  | 1.1 |  |  | — |  |  | 1.4 |  |  | — |
Commercial paper | 0.9 |  |  | — |  |  | — |  |  | — |  |  | 0.9 |  |  | — |
Total restricted securities available for sale | $ | 42.4 |  |  | $ | (0.6 | ) |  | $ | 11.4 |  |  | $ | (0.2 | ) |  | $ | 53.8 |  |  | $ | (0.8 | )
(In millions) | Securities Available for Sale with Gross Unrealized Losses as of December 31, 2017
| 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 | $ | 11.1 |  |  | $ | (0.1 | ) |  | $ | 1.9 |  |  | $ | — |  |  | $ | 13.0 |  |  | $ | (0.1 | )
U.S. Government and agency securities | 11.0 |  |  | (0.1 | ) |  | 7.9 |  |  | (0.1 | ) |  | 18.9 |  |  | (0.2 | )
Asset-backed securities | 4.9 |  |  | — |  |  | 1.0 |  |  | — |  |  | 5.9 |  |  | — |
Mortgage-backed securities | 1.2 |  |  | — |  |  | 1.2 |  |  | — |  |  | 2.4 |  |  | — |
Total restricted securities available for sale | $ | 28.2 |  |  | $ | (0.2 | ) |  | $ | 12.0 |  |  | $ | (0.1 | ) |  | $ | 40.2 |  |  | $ | (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
|  | September 30, 2018 |  | December 31, 2017
Contractual Maturity |  | Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Within one year |  | $ | 2.5 |  |  | $ | 2.5 |  |  | $ | 2.5 |  |  | $ | 2.5 |
Over one year to five years |  | 53.0 |  |  | 52.2 |  |  | 40.5 |  |  | 40.2 |
Over five years to ten years |  | 0.6 |  |  | 0.6 |  |  | 1.0 |  |  | 1.0 |
Over ten years |  | 1.4 |  |  | 1.4 |  |  | 2.4 |  |  | 2.4 |
Total restricted securities available for sale |  | $ | 57.5 |  |  | $ | 56.7 |  |  | $ | 46.4 |  |  | $ | 46.1 |

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