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Investments - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 23, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Other-than-temporary impairment impairment charges related to corporate debt securities |  | $ 9,500,000 | $ 400,000 | $ 9,500,000 |  |  |  |
Other-than-temporary impairment charges relating to securities available for sale | $ 0 |  |  |  |  |  |  |
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 |  |  |  |
Investments in unconsolidated affiliates | 851,900,000 |  | 851,900,000 |  |  | $ 887,300,000 | $ 904,500,000 | $ 397,200,000
Ceridian |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Aggregate value of ownership of common stock | 1,400,000,000 |  | 1,400,000,000 |  |  |  |  |
Investments in unconsolidated affiliates | 370,300,000 |  | 370,300,000 |  |  |  |  | $ 359,700,000
QOMPLX |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Investments in unconsolidated affiliates | 15,000,000.0 |  | 15,000,000.0 |  | $ 79,000,000.0 |  |  |
Corporate debt securities |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Debt securities held with previously recognized other than temporary impairment | $ 2,200,000 |  | $ 2,200,000 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Fixed maturity securities, term |  |  | 1 year |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Fixed maturity securities, term |  |  | 5 years |  |  |  |  |

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