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Incentive Plan Incentive Plan (Schedule of Deferred and Unearned Compensation) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Long-term incentive units |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |
Deferred compensation, expensed | $ 1.2 | $ 0.8 | $ 5.2 | $ 3.4 |
Deferred compensation, capitalized | 0.1 | 0.6 | 0.2 | 1.4 |
Unearned compensation | 11.0 |  | $ 11.0 |  | $ 6.9
Expected period to recognize unearned compensation (in years) |  |  | 2 years 11 months 28 days |  |
Market performance-based awards |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |
Deferred compensation, expensed | 3.1 | 2.7 | $ 10.0 | 7.3 |
Deferred compensation, capitalized | 0.3 | 0.6 | 0.7 | 1.9 |
Unearned compensation | 28.4 |  | $ 28.4 |  | 24.7
Expected period to recognize unearned compensation (in years) |  |  | 2 years 1 month 2 days |  |
Restricted stock |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |
Deferred compensation, expensed | 1.5 | 1.1 | $ 4.7 | 3.3 |
Deferred compensation, capitalized | 1.1 | $ 0.8 | 3.2 | $ 2.5 |
Unearned compensation | $ 23.4 |  | $ 23.4 |  | $ 17.5
Expected period to recognize unearned compensation (in years) |  |  | 2 years 9 months |  |

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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 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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