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Common Stock and Stock-Based Awards Plans - Dividends and Share Repurchase Authorization (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 14, 2020 | Mar. 31, 2020 | Feb. 19, 2020 | Oct. 26, 2018 | Mar. 06, 2018
Dividends Payable [Line Items] |  |  |  |  |
Quarterly cash dividend declared |  | $ 0.16 |  |  |
Dividend declared date |  | Mar. 16, 2020 |  |  |
Dividend record date |  | Mar. 31, 2020 |  |  |
Dividends paid |  | $ 5.5 |  |  |
Dividend paid date |  | Apr. 14, 2020 |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Repurchase of common shares program authorized amount |  |  | $ 150.0 | $ 100.0 | $ 250.0
Repurchase of common shares remaining authorized amount |  | $ 210.1 |  |  |
Subsequent Event [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Dividends paid | $ 5.8 |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: 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=27012166&loc=d3e187085-122770 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: 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=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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