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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
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Dec. 31, 2018 | Dec. 31, 2017
Pension [Member] | Private Equity Funds [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Beginning Balance | $ 33.2 | $ 40.6
Actual Return on Plan Assets | 2.8 | 7.1
Purchases, Sales, and Settlements – Net | (8.2) | (14.5)
Ending Balance | 27.8 | 33.2
Pension [Member] | Real Estate [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Beginning Balance | 25.5 | 25.6
Actual Return on Plan Assets | 0.7 | 1.7
Purchases, Sales, and Settlements – Net | (5.4) | (1.8)
Ending Balance | 20.8 | 25.5
Postretirement Health and Life [Member] | Private Equity Funds [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Beginning Balance | 8.2 | 9.5
Actual Return on Plan Assets | 0.9 | 2.6
Purchases, Sales, and Settlements – Net | (2.6) | (3.9)
Ending Balance | $ 6.5 | $ 8.2

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- 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. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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