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Summary of Significant Accounting Policies, Part 3 (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Environmental Costs [Abstract] |  |  |
Environmental reserves - current portion | $ 5.6 | $ 5.6 |
Environmental Reserves [Member] |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |
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
Minimum [Member] |  |  |
Impairment Testing for Goodwill [Abstract] |  |  |
Reporting unit, percentage of fair value in excess of carrying amount | 10.00% |  |
Accounting Standards Update 2014-09 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Percent | 1.00% |  |

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