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Contingencies Enviromental liabilities rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Beginning Balance | $ 16.8 |  |
Adjusted to expense (income) during the year |  | $ (11.6) | $ 0.0
Ending Balance | 16.1 | 16.8 |
Reserve for Environmental Costs [Member] |  |  |
Beginning Balance | 16.6 | 13.6 |
Adjusted to expense (income) during the year | 0.7 | 0.5 | 1.3
Payments made | 1.4 | 0.7 | 3.1
Ending Balance | 15.9 | 16.6 | 13.6
Other operating charges and credits [Member] |  |  |
Adjusted to expense (income) during the year | 0.0 | $ 3.2 | $ 0.5
Formal cost share [Member] |  |  |
Other Unrecorded Amounts | 2.0 |  |
Indemnification Agreement [Member] |  |  |
Other Unrecorded Amounts | 2.0 |  |
Other Reserves [Member] |  |  |
Other Unrecorded Amounts | $ 0.3 |  |

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of increase (decrease) in loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of unrecorded indebtedness classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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- Definition Cash outflows made during the period for environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3367-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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