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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Current Assets and Current Liabilities [Abstract] |  |  |
Threshold for components of total current assets and current liabilities to be presented as an individual caption on Consolidated Balance Sheet | 5.00% |  |
Environmental Costs [Abstract] |  |  |
Environmental reserves - current portion | $ 5.6 | $ 5.8 |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted cash | 354.5 | 15.9 |
Increase in restricted cash | $ 338.6 | 15.9 | $ (65.6)
Minimum [Member] |  |  |
Derivative Instruments [Abstract] |  |  |
Expected offset percentage of change in fair value derivative instrument | 80.00% |  |
Maximum [Member] |  |  |
Derivative Instruments [Abstract] |  |  |
Expected offset percentage of change in fair value derivative instrument | 125.00% |  |
Allowance for Doubtful Accounts [Member] |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 12.1 | 13.9 | 7.5
Charged to costs and expenses | 2.3 | 0.8 | 8.4
Deductions | (3.1) | (2.6) | (2.0)
Balance at end of period | 11.3 | 12.1 | 13.9
Environmental Reserves [Member] |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |
Balance at beginning of period | 13.0 | 15.6 | 9.9
Charged to costs and expenses | 7.0 | 6.4 | 11.9
Acquisition-related additions and other | 0.5 | 1.1 | 2.5
Deductions | (8.6) | (10.1) | (8.7)
Balance at end of period | $ 11.9 | $ 13.0 | $ 15.6
Minor Investment [Member] | Minimum [Member] |  |  |
Consolidation Policy [Abstract] |  |  |
Equity method of ownership interest | 3.00% |  |
Minor Investment [Member] | Maximum [Member] |  |  |
Consolidation Policy [Abstract] |  |  |
Equity method of ownership interest | 50.00% |  |
Major Investment [Member] | Minimum [Member] |  |  |
Consolidation Policy [Abstract] |  |  |
Equity method of ownership interest | 20.00% |  |
Major Investment [Member] | Maximum [Member] |  |  |
Consolidation Policy [Abstract] |  |  |
Equity method of ownership interest | 50.00% |  |
Initial Margin Requirement [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted cash | $ 35.6 |  |
Variation Margin Requirement [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted cash | 318.9 |  |
Increase in restricted cash | $ 339.3 |  |

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