Retirement Benefit Plans - Net Periodic Benefit Cost (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Settlements, curtailments and other			$ 3.1
Pension settlement loss					5.7
U.S. Plans:
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Interest cost			12.1	11.6	14.3
Expected return on plan assets			(17.6)	(18.2)	(18.8)
Settlements, curtailments and other					5.7
Amortization of unrecognized prior service benefit			(0.8)	(0.8)	(0.7)
Amortization of unrecognized loss			6.5	8.2	8.1
Net periodic benefit cost			3.3	0.8	8.6
Pension settlement loss	0.4	2.7	3.1	0	0
Non-U.S. Plans:
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost			12.8	12.4	9.1
Interest cost			18.1	16.6	17.2
Expected return on plan assets			(21.1)	(11.0)	(9.3)
Settlements, curtailments and other			0.7	0.2	0.5
Amortization of unrecognized loss			4.8	5.3	1.2
Net periodic benefit cost			15.3	23.5	18.7
U.S. other postretirement benefit plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost			0.3	0.4	0.5
Interest cost			6.7	6.8	10.1
Amortization of unrecognized prior service benefit			(6.4)	(6.4)	(6.4)
Amortization of unrecognized loss			2.7	4.9	6.9
Net periodic benefit cost			3.3	5.7	11.1
Other post employment plans amortization of net losses expected in the next year			3.1
Amortization of net prior service cost expected in the next year			(5.7)
Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Amortization of net (losses) expected in next year			$ 13.6