Leases - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020
Lessee, Lease, Description [Line Items]
Lessee, operating lease, lease not yet commenced, amount	$ 27.5
Lessee, operating lease, lease not yet commenced, term of contract	15 years
Operating lease, reduction of base rent payments over lease term	$ (1.3)
Increase (decrease) in operating lease, right-of-use asset	(8.1)
Increase (decrease) in operating lease, liability, noncurrent	(10.5)
Increase (decrease) in operating lease, liability, current	(0.6)
Increase (decrease) in change between operating lease right-of-use assets and operating lease, liabilities	3.0
Gain (loss) on termination of lease	(4.4)
Impairment charge on termination of lease	$ 2.9
COVID-19
Lessee, Lease, Description [Line Items]
Lessee, operating lease, deferred lease payments		$ 0.8
Increase (decrease) in cash savings		$ 0.4