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Cash, Cash Equivalents and Short-Term Investments - Schedule of Components (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | $ 334.2 | $ 551.3
Cash equivalents, unrealized loss | (0.1) |
Total cash equivalents | 334.1 | 551.3
Short-term investments, amortized cost | 777.9 | 606.3
Short-term investments, unrealized gain | 5.9 | 1.5
Total cash, cash equivalents, and short term investments, unrealized losses | 0.4 |
Short-term investments, unrealized loss | (0.3) | (0.1)
Short-term investments, estimated fair value | 783.5 | 607.7
Total cash, cash equivalents, and short term investments, before unrealized gains (losses) on investments | 1,112.1 | 1,157.6
Total cash, cash equivalents, and short term investments | 1,117.6 | 1,159.0
Corporate notes and obligations |  |
Cash and Cash Equivalents [Line Items] |  |
Short-term investments, amortized cost | 358.3 | 285.5
Short-term investments, unrealized gain | 3.3 | 1.2
Short-term investments, unrealized loss | (0.2) | (0.1)
Short-term investments, estimated fair value | 361.4 | 286.6
US Treasury securities |  |
Cash and Cash Equivalents [Line Items] |  |
Short-term investments, amortized cost | 234.1 | 171.0
Short-term investments, unrealized gain | 1.7 | 0.3
Short-term investments, unrealized loss | 0.0 | 0.0
Short-term investments, estimated fair value | 235.8 | 171.3
Asset-backed securities |  |
Cash and Cash Equivalents [Line Items] |  |
Short-term investments, amortized cost | 83.0 | 53.8
Short-term investments, unrealized gain | 0.7 | 0.0
Short-term investments, unrealized loss | (0.1) | 0.0
Short-term investments, estimated fair value | 83.6 | 53.8
Commercial paper |  |
Cash and Cash Equivalents [Line Items] |  |
Short-term investments, amortized cost | 40.0 | 24.2
Short-term investments, unrealized gain | 0.0 | 0.0
Short-term investments, unrealized loss | 0.0 | 0.0
Short-term investments, estimated fair value | 40.0 | 24.2
US Agency securities |  |
Cash and Cash Equivalents [Line Items] |  |
Short-term investments, amortized cost | 27.8 | 27.2
Short-term investments, unrealized gain | 0.1 | 0.0
Short-term investments, unrealized loss | 0.0 | 0.0
Short-term investments, estimated fair value | 27.9 | 27.2
Certificates of deposit |  |
Cash and Cash Equivalents [Line Items] |  |
Short-term investments, amortized cost | 26.0 | 38.2
Short-term investments, unrealized gain | 0.0 | 0.0
Short-term investments, unrealized loss | 0.0 | 0.0
Short-term investments, estimated fair value | 26.0 | 38.2
Municipal securities |  |
Cash and Cash Equivalents [Line Items] |  |
Short-term investments, amortized cost | 5.9 | 2.4
Short-term investments, unrealized gain | 0.1 | 0.0
Short-term investments, unrealized loss | 0.0 | 0.0
Short-term investments, estimated fair value | 6.0 | 2.4
Foreign government obligations |  |
Cash and Cash Equivalents [Line Items] |  |
Short-term investments, amortized cost | 2.8 |
Short-term investments, unrealized gain | 0.0 |
Short-term investments, unrealized loss | 0.0 |
Short-term investments, estimated fair value | 2.8 |
Supranational securities |  |
Cash and Cash Equivalents [Line Items] |  |
Short-term investments, amortized cost |  | 4.0
Short-term investments, unrealized gain |  | 0.0
Short-term investments, unrealized loss |  | 0.0
Short-term investments, estimated fair value |  | 4.0
Cash |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | 88.5 | 105.0
Total cash equivalents | 88.5 | 105.0
Money market funds |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | 241.6 | 444.3
Cash equivalents, unrealized loss | (0.1) |
Total cash equivalents | 241.5 | 444.3
Municipal securities |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | 1.8 |
Total cash equivalents | 1.8 |
Commercial paper |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | 1.2 | 2.0
Total cash equivalents | 1.2 | $ 2.0
Corporate notes and obligations |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | 1.1 |
Total cash equivalents | $ 1.1 |

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