Schedule 2 - Parent Company Financial Statements - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Operating Cash Flows from Operating Leases (Fixed Payments)	$ 15.8	$ 20.0
Operating Cash Flows from Operating Leases (Liability Reduction)	17.5	17.6
Financing Cash Flows from Finance Leases	0.3	0.7
Parent Company
Condensed Financial Statements, Captions [Line Items]
Operating Cash Flows from Operating Leases (Fixed Payments)	(2.1)	1.2
Operating Cash Flows from Operating Leases (Liability Reduction)	0.3	1.0
Financing Cash Flows from Finance Leases	$ 0.0	$ 7.9