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Postretirement benefits (Tables) (Other Postretirement Benefit Plans, Defined Benefit [Member])
 12 Months Ended
Dec. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Funded Status [Table Text Block]
Changes in benefit obligation and plan assets, and a reconciliation of the funded status at December 31, 2012 and 2011, are as follows:
 
(in millions)
 
2012
 
2011
Change in Benefit Obligation
 
 

 
 

Benefit obligation at the beginning of the year
 
$
9.4

 
$
7.8

Service cost
 
0.3

 
0.3

Interest cost
 
0.4

 
0.4

Participant contributions
 
0.4

 
0.6

Plan amendments
 
—

 
0.9

Actuarial loss
 
0.1

 
1.2

Benefits paid
 
(1.5
)
 
(1.8
)
Benefit obligation at the end of the year
 
$
9.1

 
$
9.4

 
 
 
 
 
Change in Plan Assets
 
 

 
 

Fair value of plan assets at the beginning of the year
 
$
—

 
$
—

Participant contributions
 
0.4

 
0.6

Employer contribution
 
1.1

 
1.2

Benefits paid
 
(1.5
)
 
(1.8
)
Fair value of plan assets at the end of the year
 
$
—

 
$
—

 
 
 
 
 
Unfunded status at year end:
 
$
(9.1
)
 
$
(9.4
)

(in millions)
 
2012
 
2011
Amount recognized in consolidated balance sheet consists of:
 
 

 
 

Accrued benefit liability, current
 
$
(0.6
)
 
$
(0.7
)
Accrued benefit liability, non-current
 
(8.5
)
 
(8.7
)
Deferred tax liability
 
(2.8
)
 
(3.1
)
Accumulated other comprehensive income
 
(4.5
)
 
(5.2
)
Net amount related to postretirement benefit plans
 
$
(16.4
)
 
$
(17.7
)
 
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]
Accumulated other comprehensive income related to other postretirement benefit plans is as follows:
 
(in millions)
 
2012
 
2011
Unrecognized net actuarial gains
 
$
(3.0
)
 
$
(4.6
)
Unrecognized net prior service credits
 
(4.3
)
 
(3.7
)
Tax expense
 
2.8

 
3.1

Accumulated other comprehensive loss (income), end of year
 
$
(4.5
)
 
$
(5.2
)