Employee Retirement Plans (Estimated Contributions and Benefit Payments) (Details) $ in Millions	Dec. 31, 2018 USD ($)
Pension Benefits
Defined Benefit Plan, Estimated Future Benefit Payments
2019	$ 40.4
2020	38.8
2021	38.0
2022	36.8
2023	35.3
2024 – 2028	160.7
Thereafter	126.4
Total	476.4
Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Expected employer contributions in next fiscal year	4.7
Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Expected employer contributions in next fiscal year	$ 1.8

Defined Benefit Plan, Expected Future Benefit Payments, Thereafter

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Section 50
-Paragraph 1
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