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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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 (in hundredths) | 5.00% |  |
Environmental Costs [Abstract] |  |  |
Environmental reserves - current portion | $ 5.8 | $ 8.1 |
Restricted Cash [Abstract] |  |  |
Restricted cash | $ 15.9 | 0.0 |
Minimum [Member] |  |  |
Derivative Instruments [Abstract] |  |  |
Expected offset percentage of change in fair value derivative instrument (in hundredths) | 80.00% |  |
Maximum [Member] |  |  |
Derivative Instruments [Abstract] |  |  |
Expected offset percentage of change in fair value derivative instrument (in hundredths) | 125.00% |  |
Allowance for Doubtful Accounts, Current [Member] |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 13.9 | 7.5 | $ 13.2
Charged to costs and expenses | 0.8 | 8.4 | 2.1
Deductions | (2.6) | (2.0) | (7.8)
Balance at end of period | 12.1 | 13.9 | 7.5
Reserve for Environmental Costs [Member] |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |
Balance at beginning of period | 15.6 | 9.9 | 13.7
Charged to costs and expenses | 6.4 | 11.9 | 3.9
Acquisition-related additions and other | 1.1 | 2.5 | 0.7
Deductions | (10.1) | (8.7) | (8.4)
Balance at end of period | $ 13.0 | $ 15.6 | $ 9.9
Minor Investment [Member] | Minimum [Member] |  |  |
Consolidation Policy [Abstract] |  |  |
Equity method of ownership interest (in hundredths) | 3.00% |  |
Minor Investment [Member] | Maximum [Member] |  |  |
Consolidation Policy [Abstract] |  |  |
Equity method of ownership interest (in hundredths) | 50.00% |  |
Major Investment [Member] | Minimum [Member] |  |  |
Consolidation Policy [Abstract] |  |  |
Equity method of ownership interest (in hundredths) | 20.00% |  |
Major Investment [Member] | Maximum [Member] |  |  |
Consolidation Policy [Abstract] |  |  |
Equity method of ownership interest (in hundredths) | 50.00% |  |

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