Leases Operating leases (Details) $ in Millions	Dec. 31, 2019 USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020	$ 6.4
2021	4.0
2022	2.6
2023	2.0
2024	1.7
Thereafter	6.0
Total undiscounted operating lease payments	22.7
Less imputed interest	3.7
Present value of operating lease liabilities	$ 19.0
Weighted average remaining lease term	5 years 9 months 18 days
Weighted average discount rate	4.80%
Other assets
Right of use asset	$ 15.6
Accrued liabilities
Operating lease, current liability	5.5
Other liabilities
Operating Lease, noncurrent liability	$ 13.5