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Financial Instruments - Schedule Of Available-For-Sale Investments With Unrealized Losses (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | $ 715.6 | $ 519.4
Unrealized losses less than 12 months | (0.2) | (0.5)
Unrealized losses 12 months or greater Fair Value | 0.0 | 133.0
Unrealized losses 12 months or greater | 0.0 | (0.3)
Total Fair Value | 715.6 | 652.4
Total Unrealized Losses | (0.2) | (0.8)
Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | 352.7 | 237.0
Unrealized losses less than 12 months | (0.2) | (0.2)
Unrealized losses 12 months or greater Fair Value | 0.0 | 0.0
Unrealized losses 12 months or greater | 0.0 | 0.0
Total Fair Value | 352.7 | 237.0
Total Unrealized Losses | (0.2) | (0.2)
U.S. treasuries |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | 278.1 | 236.5
Unrealized losses less than 12 months | 0.0 | (0.2)
Unrealized losses 12 months or greater Fair Value | 0.0 | 87.5
Unrealized losses 12 months or greater | 0.0 | (0.2)
Total Fair Value | 278.1 | 324.0
Total Unrealized Losses | 0.0 | (0.4)
U.S. government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | 63.5 | 45.9
Unrealized losses less than 12 months | 0.0 | (0.1)
Unrealized losses 12 months or greater Fair Value | 0.0 | 45.5
Unrealized losses 12 months or greater | 0.0 | (0.1)
Total Fair Value | 63.5 | 91.4
Total Unrealized Losses | 0.0 | $ (0.2)
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | 21.3 |
Unrealized losses less than 12 months | 0.0 |
Unrealized losses 12 months or greater Fair Value | 0.0 |
Unrealized losses 12 months or greater | 0.0 |
Total Fair Value | 21.3 |
Total Unrealized Losses | $ 0.0 |

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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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