Leases - Lease Cost (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Lease Cost:
Amortization of Right-of-Use Assets - Finance Leases	$ 0.7
Operating Lease Cost	20.7
Short-Term Lease Cost	0.1
Total Expense	21.5
Less: Sublease Income	0.1
Total Lease Cost	$ 21.4