Pensions and Other Benefit Programs - (Narrative) (Details) - Retirement Income Plan (RIP) [Member] $ in Millions	1 Months Ended	9 Months Ended
	Feb. 29, 2020 USD ($) Participant	Sep. 30, 2020 USD ($)	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Settled benefit obligations	$ 1,045.3
Number of retirees and beneficiaries participants | Participant	10,300
Settlement loss	$ 374.4
Projected benefit obligations	387.5
Fair value of plan assets	$ 499.6
Benefit obligation discount rate	3.07%		3.16%
Expected long-term return on plan assets	5.25%
Number of deferred vested and active participants | Participant	3,000
Non-cash expense		$ 2.0