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Share Repurchases (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Feb. 19, 2020 | Feb. 25, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Value of common stock repurchases | $ 82,000,000 | $ 51,000,000 | $ 4,000,000 |  |
Number of shares (in shares) | 148,535 | 168,671 |  |  |
Average price per share (usd per share) | $ 32.39 | $ 25.65 |  |  |
Value of common stock repurchases | $ 4,000,000 | $ 4,000,000 |  |  |
Number of shares (in shares) | 2,022,878 | 1,992,105 |  |  |
Average price per share (usd per share) | $ 40.85 | $ 25.70 |  |  |
Value of common stock repurchases | $ 82,000,000 | $ 51,000,000 |  |  |
Stock repurchase program, authorized amount |  |  |  | $ 350,000,000 | $ 350,000,000
Share Repurchase Program 2014 |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Number of shares (in shares) | 1,874,343 | 1,823,434 |  |  |
Average price per share (usd per share) | $ 41.52 | $ 25.70 |  |  |
Value of common stock repurchases | $ 78,000,000 | $ 47,000,000 |  |  |

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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=123467817&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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