Benefit Plans, Estimated Amortization of Amounts in Other Accumulated Comprehensive Income (Details) $ in Millions	Dec. 31, 2018 USD ($)
Pension Benefits [Member]
Amounts that will be amortized from Accumulated other comprehensive income (loss) in next fiscal year [Abstract]
Amortization of net (gain) loss	$ 9.6
Total costs to be recognized	9.6
Post-retirement Benefits [Member]
Amounts that will be amortized from Accumulated other comprehensive income (loss) in next fiscal year [Abstract]
Amortization of net (gain) loss	(0.8)
Total costs to be recognized	$ (0.8)

Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (s)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant