Pension and Other Post Retirement Benefits - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) Postretirement_Plan	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of Postretirement Plans | Postretirement_Plan	2
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 2.3	$ 2.2	$ 1.9
Defined Benefit Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlement expense	0.0	2.1	$ 0.2
Aggregate accumulated benefit obligation	450.5	394.8
Defined benefit plan, estimated future employer contributions in next fiscal year	6.2
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 1.9	$ 6.6