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Investments with Continuous Unrealized Losses (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | $ 365.1 | $ 963.0
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (0.6) | (5.4)
Investments with continuous unrealized losses for 12 months or greater, Fair value | 466.6 | 2,287.1
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses | (0.6) | (27.5)
Total Investments with continuous unrealized losses, Fair Value | 831.7 | 3,250.1
Total Investments with continuous unrealized losses, Unrealized losses | (1.2) | (32.9)
Government And Corporate Debentures Fixed Interest Rate |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | 227.9 | 807.3
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (0.3) | (4.4)
Investments with continuous unrealized losses for 12 months or greater, Fair value | 332.5 | 1,852.6
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses | (0.4) | (22.3)
Total Investments with continuous unrealized losses, Fair Value | 560.4 | 2,659.9
Total Investments with continuous unrealized losses, Unrealized losses | (0.7) | (26.7)
Government Sponsored Enterprises Debentures |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | 117.3 | 40.2
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (0.3) | (0.1)
Investments with continuous unrealized losses for 12 months or greater, Fair value | 123.6 | 429.1
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses | (0.2) | (5.2)
Total Investments with continuous unrealized losses, Fair Value | 240.9 | 469.3
Total Investments with continuous unrealized losses, Unrealized losses | (0.5) | (5.3)
Government And Corporate Debentures Floating Interest Rate |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | 19.9 | 115.5
Investments with continuous unrealized losses for less than 12 months, Unrealized losses |  | (0.9)
Investments with continuous unrealized losses for 12 months or greater, Fair value | 10.5 | 5.4
Total Investments with continuous unrealized losses, Fair Value | $ 30.4 | 120.9
Total Investments with continuous unrealized losses, Unrealized losses |  | $ (0.9)

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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 No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 + Details
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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 less than twelve months. + References No definition available. + Details
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