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Cash, Cash Equivalents and Short-Term Investments - Schedule of Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 359.2	$ 519.3
Total cash equivalents	359.2	519.3
Short-term investments, amortized cost	555.5	570.5
Short-term investments, unrealized gain	0.6	0.1
Short-term investments, unrealized loss	(0.1)	(0.6)
Short-term investments, estimated fair value	556.0	570.0
Total cash, cash equivalents, and short term investments, before unrealized gains (losses) on investments	914.7	1,089.8
Total cash, cash equivalents, and short term investments	915.2	1,089.3
Corporate notes and obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	244.7	269.6
Short-term investments, unrealized gain	0.6	0.1
Short-term investments, unrealized loss	0.0	(0.5)
Short-term investments, estimated fair value	245.3	269.2
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	193.0	176.0
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	(0.1)	(0.1)
Short-term investments, estimated fair value	192.9	175.9
Certificates of deposit
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	52.2	70.6
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	0.0	0.0
Short-term investments, estimated fair value	52.2	70.6
U.S. agency obligations
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	38.5	37.1
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	0.0	0.0
Short-term investments, estimated fair value	38.5	37.1
Commercial paper
Cash and Cash Equivalents [Line Items]
Short-term investments, amortized cost	27.1	17.2
Short-term investments, unrealized gain	0.0	0.0
Short-term investments, unrealized loss	0.0	0.0
Short-term investments, estimated fair value	27.1	17.2
Cash
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	109.8	103.0
Total cash equivalents	109.8	103.0
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	226.9	355.5
Total cash equivalents	226.9	355.5
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents		33.4
Total cash equivalents		33.4
Commercial paper
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	19.5	27.4
Total cash equivalents	19.5	$ 27.4
Corporate notes and obligations
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	3.0
Total cash equivalents	$ 3.0

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Cash, Cash Equivalents, And Short Term Investments, Amortized Cost

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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