Pension and Other Benefit Programs (Schedule of Periodic Benefit Costs (Credits) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
U.S. Defined-Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost of benefits earned during the period	$ 1.2	$ 1.4
Interest cost on projected benefit obligation	12.6	11.5
Expected return on plan assets	(20.1)	(24.0)
Amortization of net actuarial (gain) loss	4.8	5.0
Net periodic pension/postretirement (credit)	(1.5)	(6.1)
Retiree Health And Life Insurance Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	0.6	0.6
Amortization of net actuarial (gain) loss	(2.2)	(1.4)
Net periodic pension/postretirement (credit)	$ (1.6)	$ (0.8)