Leases - Narratives (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) facility	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) facility	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Leases [Abstract]
Right of use assets	$ 27.5		$ 27.5		$ 29.0
Operating lease liability	27.2		27.2		28.7
Operating lease liabilities, current	$ 5.0		$ 5.0		$ 5.1
Weighted average lease term	5 years 2 months 12 days		5 years 2 months 12 days
Operating lease weighted average discount rate (percent)	2.30%		2.30%
Operating lease rent expense	$ 3.0	$ 3.0	$ 6.0	$ 5.9
Number of operating contracts | facility	8		8