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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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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.

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