Accounting Policies - New Accounting Policies, Leases (Details) - USD ($) $ in Millions	Jan. 01, 2019	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Practical expedients - Package	true
Practical expedients - Hindsight	false
Operating right-of-use assets		$ 39.1
Operating Lease, Liability		$ 41.5
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating right-of-use assets	$ 33.6
Operating Lease, Liability	$ 33.9