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Derivative Instruments and Fair Value Accounting Fair Value Tables (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value, Inputs, Level 1 [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The assets measured as Level 1 in the fair value hierarchy are summarized below:
| Level 1
| June 30, 2019 |  | December 31, 2018
| (in millions)
Assets: |  |  |
Cash equivalents | $ | 32.6 |  |  | $ | 124.9 |
Restricted cash | 113.7 |  |  | 171.6 |
Total assets | $ | 146.3 |  |  | $ | 296.5 |
Fair Value, Inputs, Level 2 [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The liabilities measured as Level 2 in the fair value hierarchy are summarized below:
| Level 2
| June 30, 2019 |  | December 31, 2018
| (in millions)
Liabilities: |  |  |
Interest rate hedge (1) | $ | 29.2 |  |  | $ | 12.9 |
Total liabilities | $ | 29.2 |  |  | $ | 12.9 |
(1) Included in accrued liabilities in our Consolidated Balance Sheets

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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 Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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