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Investments - Narrative (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |
Other-than-temporary impairment impairment charges related to corporate debt securities | $ 300,000 |
Other-than-temporary impairment charges relating to securities available for sale |  | $ 0
Ceridian |  |
Debt Securities, Available-for-sale [Line Items] |  |
Aggregate value of ownership of common stock | 1,700,000,000 |
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Proceeds from sale of equity securities |  | 17,700,000
Realized gains related to the sales of equity securities available for sale (less than for 2018) |  | $ 100,000
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities held with previously recognized other than temporary impairment | $ 1,900,000 |
Minimum |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, maturity (greater than and less than) | 1 year |
Maximum |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, maturity (greater than and less than) | 5 years |

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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column C.7) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column E.2,3) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column C.3,4) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13.Column C.6) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010 + Details
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