Leases (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lessee, Lease, Description [Line Items]
Right-of-use asset recognized as non-cash asset addition			$ 3.9	$ 2.4
Cash paid for amounts included in measurement of operating lease liability			3.2	3.0
Total operating lease expense	$ 4.2	$ 2.7	11.3	6.8
Operating lease expense	1.3	0.9	3.3	2.8
Operating lease revenues	$ 2.9	$ 3.0	$ 9.0	$ 9.4
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	13 years		13 years
Operating leases remaining term, lessor	10 years		10 years