Basis of Presentation Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 9.0
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	3.7
WRAP Plan Liabilities	21.0	$ 26.8
WRAP Plan Investments	20.6	$ 23.1
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	2.0
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	2.0
SERP [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	7.0
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	1.5
Medical Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 0.2