Consolidated Statement of Shareowners' Equity Consolidated Statement of Shareowners' Equity - USD ($) $ in Millions	Total	Common Stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss	Common stock in treasury, at cost
Adoption of accounting standard				$ 0.0
Balance at beginning of period at Sep. 30, 2017			$ 1,638.0	6,103.4	$ (1,179.2)	$ (4,080.0)
Share-based compensation expense			7.8
Shares delivered under incentive plans			(2.9)
Net income (loss)	$ (236.4)			(236.4)
Cash dividends (2018, $0.97 per share; 2017, $0.835 per share)				(107.3)
Other comprehensive income (loss)	3.5				3.5
Purchases						(208.6)
Shares delivered under incentive plans						36.5
Balance at end of period at Dec. 31, 2017	2,156.2	$ 181.4	1,642.9	5,759.7	(1,175.7)	(4,252.1)
Adoption of accounting standard				6.1
Balance at beginning of period at Sep. 30, 2018	1,617.5		1,681.4	6,198.1	(941.9)	(5,501.5)
Share-based compensation expense			10.3
Shares delivered under incentive plans			(17.3)
Net income (loss)	80.3			80.3
Cash dividends (2018, $0.97 per share; 2017, $0.835 per share)				(116.9)
Other comprehensive income (loss)	(35.0)				(35.0)
Purchases						(292.8)
Shares delivered under incentive plans						22.1
Balance at end of period at Dec. 31, 2018	$ 1,274.3	$ 181.4	$ 1,674.4	6,167.6	(976.9)	$ (5,772.2)
Net income (loss)				80.3
Other comprehensive income (loss)					$ (35.0)
Balance at end of period at Jan. 01, 2019				$ 6,204.2