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Stockholders’ Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 07, 2019 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | May 06, 2020 | Aug. 06, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Value of additional shares authorized to be repurchased |  |  |  |  |  |  |  | $ 200.0 |
Remaining authorized repurchase amount |  |  |  |  |  |  |  | $ 333.3 | $ 133.3
Repurchases of common stock |  |  |  |  |  | $ 110.4 |  |  |
Average cost per share (in dollars per share) |  |  |  |  |  | $ 68.29 |  |  |
Employee Stock Purchase Plan | Employee Stock Option |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of exercisable options |  |  |  |  | 1,300,000 |  |  |  |
Shares issued under employee stock purchase plan (in shares) |  |  | 13,214 |  | 13,291 | 17,720 | 12,638 |  |
Price per share (in dollars per share) |  | $ 56.81 | $ 63.21 | $ 66.26 | $ 61.64 | $ 56.81 | $ 66.26 |  |
Compensation costs |  | $ 0.2 |  | $ 0.1 |  | $ 0.5 |  |  |
Private Placement |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) | 1,600,000 |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ 83.00 |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock | $ 128.9 |  |  |  |  |  |  |  |
Payments of stock issuance costs | 1.7 |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  |  |  | 1,600,000 |  |  |
Repurchases of common stock |  |  |  |  |  | $ 0.2 |  |  |
Accrued Liabilities and Other Liabilities | Private Placement |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Payments of stock issuance costs | $ 0.3 |  |  |  |  |  |  |  |

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