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Financial Instruments - Schedule Of Available-For-Sale Investments With Unrealized Losses (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | $ 1,996.3 | $ 2,680.2
Unrealized losses less than 12 months | (7.2) | (13.4)
Unrealized losses 12 months or greater Fair Value | 880.4 | 0.0
Unrealized losses 12 months or greater | (8.2) | 0.0
Total Fair Value | 2,876.7 | 2,680.2
Total Unrealized Losses | (15.4) | (13.4)
Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | 567.6 | 1,056.1
Unrealized losses less than 12 months | (2.1) | (5.0)
Unrealized losses 12 months or greater Fair Value | 277.0 | 0.0
Unrealized losses 12 months or greater | (2.3) | 0.0
Total Fair Value | 844.6 | 1,056.1
Total Unrealized Losses | (4.4) | (5.0)
U.S. treasuries |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | 763.5 | 357.1
Unrealized losses less than 12 months | (2.5) | (2.0)
Unrealized losses 12 months or greater Fair Value | 206.2 | 0.0
Unrealized losses 12 months or greater | (2.2) | 0.0
Total Fair Value | 969.7 | 357.1
Total Unrealized Losses | (4.7) | (2.0)
U.S. government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | 428.9 | 538.2
Unrealized losses less than 12 months | (1.3) | (2.9)
Unrealized losses 12 months or greater Fair Value | 345.5 | 0.0
Unrealized losses 12 months or greater | (3.1) | 0.0
Total Fair Value | 774.4 | 538.2
Total Unrealized Losses | (4.4) | (2.9)
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months Fair Value | 236.3 | 728.8
Unrealized losses less than 12 months | (1.3) | (3.5)
Unrealized losses 12 months or greater Fair Value | 51.7 | 0.0
Unrealized losses 12 months or greater | (0.6) | 0.0
Total Fair Value | 288.0 | 728.8
Total Unrealized Losses | $ (1.9) | $ (3.5)

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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