Leasing - Other Information Related to the Lease (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 35.7	$ 35.6
Financing cash flows from finance leases	1.2	1.6
Lease assets added in the period:
Operating leases	39.9	58.6
Finance leases	$ 0.9	$ 2.0
Weighted-average remaining lease term:
Operating leases (in years)	5 years 1 month 6 days	5 years 3 months 18 days
Finance leases (in years)	2 years 10 months 24 days	3 years 3 months 18 days
Weighted-average discount rate:
Operating leases (percent)	3.69%	3.87%
Finance leases (percent)	2.55%	2.55%