Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Term of leases	10 years
Options to extend, term	5 years
Termination period	1 year
Operating lease expense	$ 37.1	$ 39.1
Cash outflow for operating leases	37.0	36.4
Right-of-use assets obtained in exchange for operating lease liabilities	$ 39.8	$ 22.1
Operating lease, weighted average remaining lease term	5 years	4 years
Operating lease, weighted average discount rate	3.00%	3.50%
Operating leases, rent expense			$ 44.8
2020 Acquisitions
Lessee, Lease, Description [Line Items]
Right-of-use assets obtained in exchange for operating lease liabilities	$ 9.4