Leases (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Total minimum future lease payments, leases not yet commenced	$ 1.6
Rent expense, excluding variable and short-term expenses	23.0	$ 21.7
Total rent expense including variable rent and short-term expenses	$ 25.5	$ 24.5
Minimum
Lessee, Lease, Description [Line Items]
Operating leases, not yet commenced, lease term	3 years
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, termination period	1 year
Operating leases, not yet commenced, lease term	5 years 3 months