Business and Asset Actions (Project Exit Costs) (Details) - Project Exit Costs - USD ($) $ in Millions	3 Months Ended	6 Months Ended	13 Months Ended
	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2026
Restructuring Cost and Reserve [Line Items]
Project exit costs	$ 0.0	$ 28.3	$ 3,600.0
Noncash expenses			3,300.0
Impairment of property and equipment			2,500.0
Estimated effect on cash flows, total			360.0
Restructuring Reserve [Roll Forward]
Amount accrued at beginning of period		178.3
Changes in estimates		9.3
Cash payments		(67.0)	(240.0)
Amount accrued at end of period	$ 120.6	$ 120.6	$ 120.6