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Pension plans and other postretirement benefits (Tables)
 3 Months Ended
Dec. 31, 2013
Pension Plans, Defined Benefit [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
The Company’s net periodic benefit cost for these plans are as follows:
 
 
Pension
 
Quarter Ended December 31,
 
2013
 
2012
Service cost
$
3.7

 
$
7.0

Interest cost
13.8

 
12.3

Expected return on plan assets
(17.5
)
 
(17.0
)
Amortization of prior service cost
—

 
(0.4
)
Amortization of unrecognized net loss
4.7

 
7.4

Settlement charge
0.1

 
—

Curtailment gain
—

 
(37.4
)
Net periodic benefit cost/(income)
$
4.8

 
$
(28.1
)
Other Postretirement Benefit Plans, Defined Benefit [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
 
Postretirement
 
Quarter Ended December 31,
 
2013
 
2012
Service cost
$
0.5

 
$
0.2

Interest cost
0.2

 
0.3

Amortization of prior service cost
—

 
(0.9
)
Amortization of unrecognized net gain
—

 
(0.5
)
Net periodic benefit cost
$
0.7

 
$
(0.9
)