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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

X

- 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

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X

- 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

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X

- 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

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X

- 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

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- Details

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- Details

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