Income Taxes (Details 3) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Tax Attributes, Tax Benefit Amount [Abstract]
Capital loss carryforward	$ 10.3	$ 9.9
Net operating loss carryforwards	20.4	24.4
Tax credit carryforward	15.3	$ 13.7
Subtotal - tax carryforwards	46.0
Tax Attributes, Valuation Allowance [Abstract]
Total	18.6
Non-United States [Member]
Tax Attributes, Tax Benefit Amount [Abstract]
Net operating loss carryforward, subject to expiration	6.2
Net operating loss carryforward, not subject to expiration	4.7
Capital loss carryforward	10.3
Tax Attributes, Valuation Allowance [Abstract]
Net operating loss carryforward, subject to expiration	5.8
Net operating loss carryforward, not subject to expiration	1.7
Capital loss carryforward	$ 10.3
Non-United States [Member] | Minimum [Member]
Tax Attributes, Tax Benefit Amount [Abstract]
Net operating loss carryforward, carryforward period ends	Sep. 30, 2018
Non-United States [Member] | Maximum [Member]
Tax Attributes, Tax Benefit Amount [Abstract]
Net operating loss carryforward, carryforward period ends	Sep. 30, 2027
United States [Member]
Tax Attributes, Tax Benefit Amount [Abstract]
Net operating loss carryforwards	$ 1.2
Tax credit carryforward	2.2
Tax Attributes, Valuation Allowance [Abstract]
Net operating loss carryforward, subject to expiration	0.0
Tax credit carryforward	$ 0.0
United States [Member] | Minimum [Member]
Tax Attributes, Tax Benefit Amount [Abstract]
Net operating loss carryforward, carryforward period ends	Sep. 30, 2019
Tax credit carryforward, carryforward period ends	Sep. 30, 2018
United States [Member] | Maximum [Member]
Tax Attributes, Tax Benefit Amount [Abstract]
Net operating loss carryforward, carryforward period ends	Sep. 30, 2033
Tax credit carryforward, carryforward period ends	Sep. 30, 2037
State and Local [Member]
Tax Attributes, Tax Benefit Amount [Abstract]
Net operating loss carryforwards	$ 8.3
Tax credit carryforward	13.1
Tax Attributes, Valuation Allowance [Abstract]
Net operating loss carryforward, subject to expiration	0.2
Tax credit carryforward	$ 0.6
State and Local [Member] | Minimum [Member]
Tax Attributes, Tax Benefit Amount [Abstract]
Net operating loss carryforward, carryforward period ends	Sep. 30, 2018
Tax credit carryforward, carryforward period ends	Sep. 30, 2019
State and Local [Member] | Maximum [Member]
Tax Attributes, Tax Benefit Amount [Abstract]
Net operating loss carryforward, carryforward period ends	Sep. 30, 2037
Tax credit carryforward, carryforward period ends	Sep. 30, 2032