Pension and Other Benefit Programs (Schedule of Periodic Benefit Costs (Credits) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 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	$ 3.6	$ 4.3
Interest cost on projected benefit obligation	12.5	11.5	37.7	34.6
Expected return on plan assets	(20.0)	(24.0)	(60.1)	(72.0)
Amortization of net actuarial (gain) loss	4.8	5.0	14.4	15.0
Net periodic pension/postretirement (credit)	(1.5)	(6.1)	(4.4)	(18.1)
Retiree Health And Life Insurance Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost of benefits earned during the period	0.1		0.1	0.1
Interest cost on projected benefit obligation	0.6	0.6	1.8	1.9
Amortization of prior service (credit) cost			(0.1)
Amortization of net actuarial (gain) loss	(2.2)	(1.4)	(6.4)	(4.2)
Net periodic pension/postretirement (credit)	$ (1.5)	$ (0.8)	$ (4.6)	$ (2.2)