Lease Arrangements (Classification on the Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets
Operating lease assets	$ 68.6	$ 64.3
Finance lease assets	28.2	27.1
Total lease assets	96.8	91.4
Current
Operating	12.9	11.9
Finance	7.1	7.0
Noncurrent
Operating	56.7	53.6
Finance	11.6	10.2
Total lease liabilities	$ 88.3	$ 82.7
Weighted-average remaining lease term (in years)
Operating leases	6 years 6 months	7 years 1 month 6 days
Finance leases	4 years 1 month 6 days	3 years 10 months 24 days
Weighted-average discount rate
Operating leases	5.40%	5.40%
Finance leases	4.10%	3.70%