Retirement Benefits (Tables) (Pension Plans, Defined Benefit [Member])
 3 Months Ended
Mar. 31, 2015
Pension Plans, Defined Benefit [Member]
  
Schedule of Net Benefit Costs [Table Text Block]
Net pension and retiree health benefit expense included the following components:
 
Defined Benefit Pension Plans
 
Retiree Health Benefit Plans
 
Three Months Ended
March 31,
 
Three Months Ended
March 31,
 
2015
 
2014
 
2015
 
2014
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
77.0

 
$
62.7

 
$
9.8

 
$
11.3

Interest cost
117.1

 
119.2

 
15.4

 
21.2

Expected return on plan assets
(191.8
)
 
(189.3
)
 
(37.1
)
 
(36.0
)
Amortization of prior service cost
2.5

 
0.9

 
(21.6
)
 
(7.3
)
Recognized actuarial loss
92.4

 
69.1

 
9.4

 
5.1

Net periodic benefit cost
$
97.2

 
$
62.6

 
$
(24.1
)
 
$
(5.7
)