Pensions and Postretirement Benefits Other Than Pensions (Schedule of Company's Pension Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in plan assets:
Fair value at beginning of year	$ 2,766.9
Fair value at end of year	3,136.8	$ 2,766.9
Amounts included in the balance sheet:
Other noncurrent assets	1,537.0	857.9
Pension Plans [Member]
Change in benefit obligations:
Service cost	73.6	75.0	$ 70.8
Interest cost	119.1	109.7	109.0
Actuarial (gains) losses	(54.3)	(51.3)	(56.8)
Change in plan assets:
Company contributions	140.2	131.9	118.7
Funded status:
Plan assets less than the benefit obligations	(714.4)	(698.4)
Amounts included in the balance sheet:
Other noncurrent assets	50.4	49.9
Accrued compensation and benefits	(8.7)	(25.9)
Postemployment and other benefit liabilities	(756.1)	(722.4)
Net amount recognized	(714.4)	(698.4)
Change In Benefit Obligations [Member] | Pension Plans [Member]
Change in benefit obligations:
Benefit obligation at beginning of year	3,465.3	3,742.2
Service cost	73.6	75.0
Interest cost	119.1	109.7
Employee contributions	1.1	1.1
Amendments	5.7	16.1
Actuarial (gains) losses	422.8	(224.8)
Benefits paid	225.3	218.9
Currency translation	9.0	(34.8)
Curtailments and settlements	(3.1)	(4.6)
Other, including expenses paid	(17.0)	4.3
Benefit obligation at end of year	3,851.2	3,465.3	3,742.2
Change in plan assets:
Other, including expenses paid	(17.0)	4.3
Change In Plan Assets [Member] | Pension Plans [Member]
Change in benefit obligations:
Other, including expenses paid	(21.8)	3.2
Change in plan assets:
Fair value at beginning of year	2,766.9	3,063.1
Actual return on assets	526.1	(125.9)
Company contributions	83.1	86.9	101.4
Employee contributions	1.1	1.1
Benefits paid	(225.3)	(218.9)
Currency translation	12.0	(32.8)
Settlements	(5.3)	(9.8)
Other, including expenses paid	(21.8)	3.2
Fair value at end of year	$ 3,136.8	$ 2,766.9	$ 3,063.1