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Incentive Plan Incentive Plan (Schedule of Deferred and Unearned Compensation) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Long-term incentive units |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Deferred compensation, expensed | $ 0.9 | $ 0.7 |
Deferred compensation, capitalized | 0.2 | 0.4 |
Unearned compensation | $ 15.0 |  | $ 6.9
Expected period to recognize unearned compensation (in years) | 3 years 2 months 10 days |  |
Market performance-based awards |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Deferred compensation, expensed | $ 3.1 | 2.1 |
Deferred compensation, capitalized | 0.3 | 0.7 |
Unearned compensation | $ 44.7 |  | 24.7
Expected period to recognize unearned compensation (in years) | 2 years 6 months 19 days |  |
Restricted stock |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Deferred compensation, expensed | $ 1.5 | 1.0 |
Deferred compensation, capitalized | 1.1 | $ 0.8 |
Unearned compensation | $ 30.5 |  | $ 17.5
Expected period to recognize unearned compensation (in years) | 3 years 2 months 15 days |  |

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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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