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Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested share-based compensation arrangements, compensation costs to be expensed | $ 42.6 |  |
Settlement period of phantom units | 5 years |  |
Option term | 7 years |  |
Total intrinsic value of options exercised | $ 0.5 |  |
Cash settled awards | 1.5 | $ 16.9 | $ 6.5
Incentive compensation plan expense | $ 9.8 | $ 34.1 | $ 30.0
Tranche one |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 2 years |  |
Vesting percentage | 50.00% |  |
Tranche two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
2020 Long-Term Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of shares available for issuance | 5,000,000 |  |
2018 Long-Term Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of shares available for issuance | 6,750,000 |  |
2012 Long-Term Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Option term | 7 years |  |
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Settlement period of phantom units | 3 years |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Settlement period of phantom units | 5 years |  |
Time Lapse Restricted Stock | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value per share at grant date (in USD per share) | $ 22.59 | $ 21.68 | $ 25.69
Time Lapse Restricted Stock | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value per share at grant date (in USD per share) | $ 21.68 | 28.16 | 28.43
Performance Based Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Total shareholder return, weighted percentage of PSU | 0.80 |  |
EBITDA divided by average capital employed, weighted percentage of PSU | 0.20 |  |
Fair value per share at grant date (in USD per share) | $ 21.51 | $ 28.09 |
Performance Based Restricted Stock | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value per share at grant date (in USD per share) |  |  | 22.99
Performance Based Restricted Stock | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value per share at grant date (in USD per share) |  |  | $ 30.56

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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