Other Comprehensive Income (Loss) (Reclassification) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other–net, (income) expense	$ (23.6)	$ (14.5)	$ 35.7	$ 13.9
Total before tax	1,090.9	1,593.9	3,144.5	3,070.3
Tax benefit	(138.4)	(203.7)	(289.1)	(324.8)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	60.0	90.1	121.3	179.8
Defined Benefit Pension and Retiree Health Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	71.7	109.6	145.9	218.4
Tax benefit	(15.0)	(23.0)	(30.6)	(45.9)
Total reclassifications, net of tax	56.7	86.6	115.3	172.5
Prior service benefits, net | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other–net, (income) expense	(13.1)	(13.8)	(26.1)	(27.6)
Actuarial losses, net | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other–net, (income) expense	84.8	123.4	172.0	246.0
Other, net of tax | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other–net, (income) expense	$ 3.3	$ 3.5	$ 6.0	$ 7.3