Retirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2014	Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Funded status of plan	$ (156.8)	$ (139.3)			$ (156.8)
Discretionary contributions to German plans	30.2	137.5
Pension settlement loss			5.7
Defined contribution expense	27.6	24.9	24.8
Defined benefit pension expense	18.6	24.3	27.3
Other postretirement employee benefit expense	3.3	5.7	11.1
Total	49.5	54.9	63.2
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year, Under Contractual Obligation	9.9				9.9
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in next fiscal year	15
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in next fiscal year	25
Muncie Plant [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution			15.0	23.0
U.S. Plans:
Defined Benefit Plan Disclosure [Line Items]
Funded status of plan	(40.6)	(19.5)			(40.6)
Pension settlement loss	3.1	0	0		0.4	2.7
United States
Defined Benefit Plan Disclosure [Line Items]
Funded status of plan	(40.6)	(19.5)			(40.6)
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Funded status of plan		(15.3)
Germany
Defined Benefit Plan Disclosure [Line Items]
Funded status of plan	(76.5)	(68.6)			(76.5)
Other
Defined Benefit Plan Disclosure [Line Items]
Funded status of plan	$ (39.7)	$ (35.9)			$ (39.7)