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Pension plans and other postretirement benefits (Tables)
 3 Months Ended
Dec. 31, 2012
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 is as follows:
 
 
Pension
 
Quarter Ended December 31,
 
2012
 
2011
Service cost
$
7.0

 
$
6.9

Interest cost
12.3

 
13.9

Expected return on plan assets
(17.0
)
 
(15.7
)
Amortization of prior service cost
(0.4
)
 
(1.4
)
Amortization of unrecognized net loss
7.4

 
5.1

Settlement charge
—

 
0.9

Curtailment gain
(37.4
)
 
—

Net periodic benefit cost
$
(28.1
)
 
$
9.7
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,
 
2012
 
2011
Service cost
$
0.2

 
$
0.2

Interest cost
0.3

 
0.6

Amortization of prior service cost
(0.9
)
 
(0.7
)
Amortization of unrecognized net gain
(0.5
)
 
(0.5
)
Net periodic benefit cost
$
(0.9
)
 
$
(0.4
)