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Pension and Other Postretirement Benefit Plans - Recurring Fair Value Measures, Activity in Level 3 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Pension [Member] | Private Equity Funds [Member]
Activity in Level 3 [Roll Forward]
Beginning Balance	$ 40.6	$ 43.3
Actual Return on Plan Assets	7.1	5.0
Purchases, Sales, and Settlements – Net	(14.5)	(7.7)
Ending Balance	33.2	40.6
Pension [Member] | Real Estate [Member]
Activity in Level 3 [Roll Forward]
Beginning Balance	25.6	28.9
Actual Return on Plan Assets	1.7	2.3
Purchases, Sales, and Settlements – Net	(1.8)	(5.6)
Ending Balance	25.5	25.6
Postretirement Health and Life [Member] | Private Equity Funds [Member]
Activity in Level 3 [Roll Forward]
Beginning Balance	9.5	12.0
Actual Return on Plan Assets	2.6	1.4
Purchases, Sales, and Settlements – Net	(3.9)	(3.9)
Ending Balance	$ 8.2	$ 9.5

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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