Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases (Details) [Line Items]
Lessee, Operating Lease, Renewal Term	10 years
Lessee, Operating Lease, Termination Period	1 year
Operating Lease, Weighted Average Remaining Lease Term	3 years
Operating Lease, Weighted Average Discount Rate, Percent	5.21%
Operating Leases, Rent Expense, Net	$ 11.7	$ 12.9	$ 12.7
Short-Term Lease And Variable Lease, Cost	2.0	2.4
Sublease Income	0.8	1.1
Operating Lease, Payments	11.1	$ 11.8
Lessor, Operating Lease, Lease Not yet Commenced, Assumption and Judgment, Value of Underlying Asset, Amount	$ 0.1
Minimum [Member]
Leases (Details) [Line Items]
Lessee, Operating Lease, Remaining Lease Term	1 year
Maximum [Member]
Leases (Details) [Line Items]
Lessee, Operating Lease, Remaining Lease Term	6 years