Leases (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2020	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Right-of-use asset recognized as non-cash asset addition	$ 8.7	$ 0.9	$ 0.1
Cash paid for amounts included in measurement of operating lease liability		1.0	0.9
Total operating lease expense		2.0	2.2
Operating lease expense		1.0	0.9
Operating lease revenues		$ 3.3	$ 3.3
Minimum
Lessee, Lease, Description [Line Items]
Operating leases remaining term, lessee		1 year
Operating leases remaining term, lessor		2 years
Maximum
Lessee, Lease, Description [Line Items]
Operating leases remaining term, lessee		11 years
Operating leases remaining term, lessor		10 years