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Common Shares And Stock-Based Awards Plans (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 13, 2020 | Feb. 29, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 19, 2020 | Oct. 26, 2018 | Mar. 06, 2018 | Dec. 07, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Additional shares available for issuance |  |  | 3,300 |  |  |  |  |  |
Number of options, exercisable |  |  | 270 | 300 | 400 |  |  |  |
Weighted-average exercise price of options exercisable |  |  | $ 20.02 | $ 20.07 | $ 18.56 |  |  |  |
Equity [Abstract] |  |  |  |  |  |  |  |  |
Quarterly cash dividend declared |  |  | $ 0.15 |  |  |  |  |  |
Dividend declared date |  |  | Dec. 16, 2019 |  |  |  |  |  |
Dividend record date |  |  | Dec. 30, 2019 |  |  |  |  |  |
Dividends paid |  |  | $ 23.3 | $ 21.0 |  |  |  |  |
Dividend paid date |  |  | Jan. 13, 2020 |  |  |  |  |  |
Common Shares Note [Abstract] |  |  |  |  |  |  |  |  |
Repurchase of common shares program authorized amount |  |  |  |  |  |  | $ 100.0 | $ 250.0 | $ 100.0
Repurchase of common shares remaining authorized amount |  |  | $ 79.5 |  |  |  |  |  |
Repurchase of common Shares |  |  | 4,700 | 8,200 | 1,000 |  |  |  |
Repurchase of common shares, value |  |  | $ 122.1 | $ 211.9 | $ 29.3 |  |  |  |
Repurchase of common shares, average cost per share |  |  | $ 25.86 | $ 25.71 | $ 30.46 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Equity [Abstract] |  |  |  |  |  |  |  |  |
Quarterly cash dividend declared |  | $ 0.16 |  |  |  |  |  |  |
Dividends paid | $ 5.5 |  |  |  |  |  |  |  |
Common Shares Note [Abstract] |  |  |  |  |  |  |  |  |
Repurchase of common shares program authorized amount |  |  |  |  |  | $ 150.0 |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Term of options |  |  | 10 years |  |  |  |  |  |
Employee Awards [Member] | Stock Options [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |  |
Employee Awards [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |  |
Employee Awards [Member] | Performance-Based Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |  |
Non-Employee Awards [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |  |  |  |

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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 Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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