Lease Accounting - Lessee Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Rent expense		$ 36.7	$ 42.3
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Extended lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	33 years
Extended lease term	10 years