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Share Repurchases (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 29, 2018 | May 25, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Shares repurchased | 1,000,000.0 | 900,000 |  |  |
Value of shares repurchased | $ 35,000,000 | $ 50,000,000 | $ 175,000,000 |  |
Treasury stock acquired, average cost per share (in usd per share) | $ 35.83 | $ 56.19 |  |  |
5/25/2017 Share Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount (in usd) |  |  |  |  | $ 200,000,000.0
Shares repurchased |  | 2,700,000 |  |  |
Value of shares repurchased |  | $ 175,000,000.0 |  |  |
Treasury stock acquired, average cost per share (in usd per share) |  | $ 64.94 |  |  |
11/29/2018 Share Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount (in usd) |  |  |  | $ 300,000,000.0 |
Shares repurchased |  |  | 0 |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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