Basis of Presentation Income Tax (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%	35.00%
Proceeds from Income Tax Refunds							$ 73.9
Income tax receivable	$ 165.6				$ 165.6
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	22.50%	37.80%			6.50%	54.80%