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Stockholders' Equity - Repurchase of Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 02, 2021 | Jun. 30, 2021 | May 02, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 1,000.0
Stock repurchase program, remaining authorizations | $ 970.1 |  | $ 970.1 |  |  | $ 375.2 |
Number of shares repurchased (in shares) | 527,058 | 521,498 | 6,585,112 | 521,498 |  |  |
Value of shares repurchased | $ 29.9 | $ 20.0 | $ 327.7 | $ 20.0 |  |  |
Shares acquired, average price per share (in usd per share) | $ 56.75 | $ 38.37 | $ 49.77 | $ 38.37 |  |  |
Common Stock |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  | 35,100 |  |  |  |
Value of shares repurchased | $ 1.6 |  | $ 1.6 |  |  |  |
New Share Repurchase Program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 1,000.0 |  |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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