Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions			3 Months Ended				9 Months Ended		12 Months Ended
	Jan. 03, 2017	Oct. 01, 2016	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension settlement loss			$ 5.5			$ 1.0	$ 9.6	$ 3.0
Decrease in underfunded status of pension plan due to transfer to spin-off company		$ 24.0
Effect on accumulated other comprehensive loss related to transfer of defined benefit plan assets and obligations		$ 5.0
Decrease in underfunded status of pension plan due to sale of business	$ 7.0
Company contributions							57.0	68.6	$ 79.3
Continuing Operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension settlement loss							9.6	$ 3.0
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Total expected contributions for current fiscal year			65.0				65.0
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Total expected contributions for current fiscal year			$ 85.0				85.0
Materials Technologies [Member]
Defined Benefit Plan Disclosure [Line Items]
Periodic benefit costs including settlement, curtailment, termination benefits, and other costs							$ 6.0
Materials Technologies [Member] | Business Separation Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Periodic benefit costs including settlement, curtailment, termination benefits, and other costs					$ 2.5
Materials Technologies [Member] | Discontinued Operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Periodic benefit costs including settlement, curtailment, termination benefits, and other costs				$ 3.5