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Cash, Cash Equivalents and Short-Term Investments - Narrative (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) investment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 519,300,000	$ 430,000,000	$ 352,700,000	$ 356,900,000
Short-term investments	570,000,000	0
Cash in transit for credit and debit card transactions	$ 11,900,000	13,300,000
Number of investments in unrealized loss positions | investment	202
Other-than-temporary impairment loss	$ 0
Investment income	16,800,000	3,000,000	$ 900,000
Cash
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	103,000,000	62,900,000
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 355,500,000	$ 367,100,000

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount due the Entity as a result of customers utilizing point of sale debit or credit cards in exchange transactions with the entity which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition.

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Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

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