Lease Arrangements (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Right-of-use asset	$ 13.0
Rental expense		$ 27.4	$ 22.3
Leases with related parties, annual rental expense	$ 2.2