Leases (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lessee, Lease, Description [Line Items]
Right-of-use asset recognized as non-cash asset addition			$ 2.1	$ 1.5
Cash paid for amounts included in measurement of operating lease liability			1.9	2.1
Total operating lease expense	$ 3.5	$ 2.1	7.1	4.1
Operating lease expense	1.0	0.9	2.0	1.9
Operating lease revenues	$ 3.0	$ 3.0	$ 6.1	$ 6.3
Minimum
Lessee, Lease, Description [Line Items]
Operating leases remaining term, lessee	1 year		1 year
Operating leases remaining term, lessor	2 years		2 years
Maximum
Lessee, Lease, Description [Line Items]
Operating leases remaining term, lessee	11 years		11 years
Operating leases remaining term, lessor	10 years		10 years