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Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($) performancePeriod $ / shares shares | Mar. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation expense for all nonvested awards, adjusted for estimated forfeitures | $ | $ 45.0 |
Weighted average period of recognition for unrecognized compensation expense | 2 years 3 months 18 days |
Accelerated stock compensation expense | $ | $ 2.0 |
Options exercised in period (in shares) | shares | 11,193 |
Options, exercises in period, intrinsic value | $ | $ 0.1 |
Proceeds from stock options exercised | $ | $ 0.2 |
Restricted Share Units (RSUs), Time-Based Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period | 3 years |
Restricted Share Units (RSUs), Time-Based Awards | Management |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (in shares) | shares | 621,519 |
Restricted Share Units (RSUs), Performance-Based Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (in shares) | shares | 605,732 |
Restricted Share Units (RSUs), Performance-Based Awards | Share-based Payment Arrangement, Tranche One |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (in shares) | shares | 302,866 |
Award performance period | 3 years |
Grant date fair value (in dollars per share) | $ / shares | $ 28.93 |
Restricted Share Units (RSUs), Performance-Based Awards | Share-based Payment Arrangement, Tranche Two |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (in shares) | shares | 302,866 |
Number of performance periods | performancePeriod | 3 |
Restricted share units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock compensation expense | $ | $ 9.0 | $ 8.0

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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