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Investments Continuous Unrealized Loss Position (Details) $ in Millions | Mar. 31, 2017 USD ($)
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Schedule of Available-for-sale Securities [Line Items] |
Fair value of available-for-sale securities in a continuous unrealized loss position, less than twelve months | $ 385.0
Accumulated loss, available-for-sale securities in a continuous unrealized loss position, less than twelve months | (0.4)
Fair value of available-for-sale securities in a continuous unrealized loss position, greater than twelve months | 0.0
Accumulated loss, available-for-sale securities in a continuous unrealized loss position, greater than twelve months | 0.0
Fair value of available-for-sale securities in a continuous unrealized loss position | 385.0
Accumulated loss, available-for-sale securities in a continuous unrealized loss position | (0.4)
Government agency bonds |
Schedule of Available-for-sale Securities [Line Items] |
Fair value of available-for-sale securities in a continuous unrealized loss position, less than twelve months | 196.9
Accumulated loss, available-for-sale securities in a continuous unrealized loss position, less than twelve months | (0.2)
Fair value of available-for-sale securities in a continuous unrealized loss position, greater than twelve months | 0.0
Accumulated loss, available-for-sale securities in a continuous unrealized loss position, greater than twelve months | 0.0
Fair value of available-for-sale securities in a continuous unrealized loss position | 196.9
Accumulated loss, available-for-sale securities in a continuous unrealized loss position | (0.2)
Municipal bonds - tax exempt |
Schedule of Available-for-sale Securities [Line Items] |
Fair value of available-for-sale securities in a continuous unrealized loss position, less than twelve months | 55.3
Accumulated loss, available-for-sale securities in a continuous unrealized loss position, less than twelve months | 0.0
Fair value of available-for-sale securities in a continuous unrealized loss position, greater than twelve months | 0.0
Accumulated loss, available-for-sale securities in a continuous unrealized loss position, greater than twelve months | 0.0
Fair value of available-for-sale securities in a continuous unrealized loss position | 55.3
Accumulated loss, available-for-sale securities in a continuous unrealized loss position | 0.0
Corporate bonds and debt |
Schedule of Available-for-sale Securities [Line Items] |
Fair value of available-for-sale securities in a continuous unrealized loss position, less than twelve months | 132.8
Accumulated loss, available-for-sale securities in a continuous unrealized loss position, less than twelve months | (0.2)
Fair value of available-for-sale securities in a continuous unrealized loss position, greater than twelve months | 0.0
Accumulated loss, available-for-sale securities in a continuous unrealized loss position, greater than twelve months | 0.0
Fair value of available-for-sale securities in a continuous unrealized loss position | 132.8
Accumulated loss, available-for-sale securities in a continuous unrealized loss position | $ (0.2)

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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 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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