Benefit Plans and Other Postretirement Benefits, Projected Benefit Payments (Details) $ in Millions	Dec. 31, 2018 USD ($)
Pension Plan [Member]
Defined Benefit Plan, Gross Projected Benefit Payments [Abstract]
2019	$ 29.7
2020	30.0
2021	29.3
2022	30.8
2023	30.8
2024-2028	156.2
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Gross Projected Benefit Payments [Abstract]
2019	3.2
2020	3.1
2021	3.2
2022	3.2
2023	3.2
2024-2028	14.4
Expected Medicare Part D Subsidies [Abstract]
2019	0.0
2020	0.0
2021	0.0
2022	0.0
2023	0.0
2024-2028	0.2
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]
2019	3.2
2020	3.1
2021	3.2
2022	3.2
2023	3.2
2024-2028	$ 14.2