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Financial Instruments - Schedule Of Available-For-Sale Investments With Unrealized Losses (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | $ 519.4 | $ 1,434.1
Unrealized losses less than 12 months | (0.5) | (2.8)
Unrealized losses 12 months or greater Fair Value | 133.0 | 1,427.6
Unrealized losses 12 months or greater | (0.3) | (11.1)
Total Fair Value | 652.4 | 2,861.7
Total Unrealized Losses | (0.8) | (13.9)
Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | 237.0 | 727.4
Unrealized losses less than 12 months | (0.2) | (1.7)
Unrealized losses 12 months or greater Fair Value | 0.0 | 409.6
Unrealized losses 12 months or greater | 0.0 | (3.1)
Total Fair Value | 237.0 | 1,137.0
Total Unrealized Losses | (0.2) | (4.8)
U.S. treasuries |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | 236.5 | 478.7
Unrealized losses less than 12 months | (0.2) | (0.9)
Unrealized losses 12 months or greater Fair Value | 87.5 | 592.8
Unrealized losses 12 months or greater | (0.2) | (4.4)
Total Fair Value | 324.0 | 1,071.5
Total Unrealized Losses | (0.4) | (5.3)
U.S. government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | 45.9 | 228.0
Unrealized losses less than 12 months | (0.1) | (0.2)
Unrealized losses 12 months or greater Fair Value | 45.5 | 425.2
Unrealized losses 12 months or greater | (0.1) | (3.6)
Total Fair Value | 91.4 | 653.2
Total Unrealized Losses | $ (0.2) | $ (3.8)

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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 This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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 that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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