Leases - Narrative (Details) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2019 USD ($) option	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Lessee, Lease, Description [Line Items]
Options for renewal | option	1
Rent expense			$ 21.8	$ 19.0
HST
Lessee, Lease, Description [Line Items]
Operating lease, impairment	$ 0.4	$ 0.6