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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Accounting Policies [Abstract] |  |
Schedule of Cash and Cash Equivalents [Table Text Block] | The following table provides a reconciliation of cash, cash equivalents, restricted cash and restricted cash equivalents reported in our consolidated balance sheets to the total shown in our consolidated statement of cash flows:
(In millions) | As of
| March 31, 2018 |  | December 31, 2017 |  | March 31, 2017 |  | December 31, 2016
Cash and cash equivalents | $ | 11.5 |  |  | $ | 8.2 |  |  | $ | 11.1 |  |  | $ | 14.6 |
Restricted cash and cash equivalents | 368.5 |  |  | 255.6 |  |  | 316.7 |  |  | 224.7 |
Total cash, cash equivalents, restricted cash and restricted cash equivalents | $ | 380.0 |  |  | $ | 263.8 |  |  | $ | 327.8 |  |  | $ | 239.3 |
Cash Flow, Supplemental Disclosures [Text Block] |  | The following table reconciles the consolidated statement of cash flows line items impacted by the adoption of this standard on January 1, 2018:
(In millions) | For the Three Months Ended March 31, 2017
| Adjusted |  | ASU 2016-18 Adjustment |  | Previously Reported
Decrease (increase) in restricted cash and cash equivalents | $ | — |  |  | $ | 92.0 |  |  | $ | (92.0 | )
Net cash used in investing activities | (274.4 | ) |  | 92.0 |  |  | (366.4 | )
Net increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents | 88.5 |  |  | 92.0 |  |  | (3.5 | )
Cash, cash equivalents, restricted cash and restricted cash equivalents beginning of period | 239.3 |  |  | 224.7 |  |  | 14.6 |
Cash, cash equivalents, restricted cash and restricted cash equivalents end of period | $ | 327.8 |  |  | $ | 316.7 |  |  | $ | 11.1 |

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- Definition The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -URI http://asc.fasb.org/topic&trid=2134446 + Details
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- Definition Tabular disclosure of the components of cash and cash equivalents. + References No definition available. + Details
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