Retirement Benefit Plans (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Change in benefit obligation:
Benefit obligation at beginning of year			$ 3,133.5
Service cost	4.2	9.6	19.7	28.9
Interest cost	22.3	33.6	94.3	100.9
Actuarial (gains) losses			74.4
Employee contributions			0.2
International plan exchange rate change			(10.8)
Benefits paid			(179.3)
Benefit obligation at end of year	1,986.9		1,986.9
Spinoff of Steel Change in Benefit Obligation			(1,145.1)
Pension Plan, Defined Benefit [Member]
Change in benefit obligation:
Benefit obligation at beginning of year			2,642.4
Service cost	3.6	8.9	17.9	26.7
Interest cost	18.1	29.1	80.1	87.2
Actuarial (gains) losses			86.7
Employee contributions			0
International plan exchange rate change			0
Benefits paid			(162.5)
Benefit obligation at end of year	1,601.3		1,601.3
Spinoff of Steel Change in Benefit Obligation			(1,063.3)
Foreign Pension Plan, Defined Benefit [Member]
Change in benefit obligation:
Benefit obligation at beginning of year			491.1
Service cost	0.6	0.7	1.8	2.2
Interest cost	4.2	4.5	14.2	13.7
Actuarial (gains) losses			(12.3)
Employee contributions			0.2
International plan exchange rate change			(10.8)
Benefits paid			(16.8)
Benefit obligation at end of year	385.6		385.6
Spinoff of Steel Change in Benefit Obligation			$ (81.8)