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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Significant Accounting Policies [Abstract] |
Allowance for Doubtful Accounts Activity | The following table presents our allowance for doubtful accounts activity for the periods indicated:
|  | For the Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Balance at beginning of period |  | $ | 11.3 |  |  | $ | 12.1 |  |  | $ | 13.9 |
Charged to costs and expenses |  |  | 2.7 |  |  |  | 2.3 |  |  |  | 0.8 |
Deductions |  |  | (1.9 | ) |  |  | (3.1 | ) |  |  | (2.6 | )
Balance at end of period |  | $ | 12.1 |  |  | $ | 11.3 |  |  | $ | 12.1 |
Cash, Cash Equivalents and Restricted Cash | The following table provides a reconciliation of cash and cash equivalents, and restricted cash reported within the Consolidated Balance Sheets that sum to the total of the amounts shown in the Statements of Consolidated Cash Flows.
|  | December 31, |
|  | 2017 |  |  | 2016 |
Cash and cash equivalents |  | $ | 5.1 |  |  | $ | 63.1 |
Restricted cash |  |  | 65.2 |  |  |  | 354.5 |
Total cash, cash equivalents and restricted cash shown in the Statements of Consolidated Cash Flows |  | $ | 70.3 |  |  | $ | 417.6 |
Environmental Reserves Activity | The following table presents the activity of our environmental reserves for the periods indicated:
|  | For the Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Balance at beginning of period |  | $ | 11.9 |  |  | $ | 13.0 |  |  | $ | 15.6 |
Charged to costs and expenses |  |  | 12.1 |  |  |  | 7.0 |  |  |  | 6.4 |
Acquisition-related additions and other |  |  | 1.7 |  |  |  | 0.5 |  |  |  | 1.1 |
Deductions |  |  | (14.1 | ) |  |  | (8.6 | ) |  |  | (10.1 | )
Balance at end of period |  | $ | 11.6 |  |  | $ | 11.9 |  |  | $ | 13.0 |

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- Definition Tabular disclosure of the allowance for doubtful accounts, including charges and other changes to the balance. + References No definition available. + Details
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- Definition Tabular disclosure of material changes in the expected aggregate amount of environmental loss contingencies since the prior balance sheet date. This element may be used for an entity's entire roll forward of environmental loss contingencies. + References No definition available. + Details
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