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Postretirement benefits (Tables) - Other Postretirement Benefit Plans, Defined Benefit [Member]
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015, are as follows: 
(in millions)
 
2016
 
2015
Change in Benefit Obligation
 
 

 
 

Benefit obligation at the beginning of the year
 
$
5.7

 
$
7.1

Interest cost
 
0.2

 
0.3

Participant contributions
 
0.7

 
0.8

Plan amendments
 
(1.1
)
 
—

Actuarial gain
 
(0.3
)
 
(1.0
)
Benefits paid
 
(1.0
)
 
(1.5
)
Benefit obligation at the end of the year
 
$
4.2

 
$
5.7

 
 
 
 
 
Change in Plan Assets
 
 

 
 

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

 
$
—

Participant contributions
 
0.7

 
0.8

Employer contributions
 
0.3

 
0.7

Benefits paid
 
(1.0
)
 
(1.5
)
Fair value of plan assets at the end of the year
 
$
—

 
$
—

 
 
 
 
 
Unfunded status at year end:
 
$
(4.2
)
 
$
(5.7
)

(in millions)
 
2016
 
2015
Amount recognized in consolidated balance sheet consists of:
 
 

 
 

Accrued benefit liability, current
 
$
(0.4
)
 
$
(0.4
)
Accrued benefit liability, non-current
 
(3.8
)
 
(5.3
)
Sub-total
 
(4.2
)
 
(5.7
)
Deferred tax liability
 
(2.2
)
 
(2.0
)
Accumulated other comprehensive income
 
(3.3
)
 
(3.1
)
Net amount related to postretirement benefit plans
 
$
(9.7
)
 
$
(10.8
)
 
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)
 
2016
 
2015
Unrecognized net actuarial gains
 
$
(4.7
)
 
$
(5.1
)
Net prior service costs
 
(0.7
)
 
—

Tax expense
 
2.1

 
2.0

Accumulated other comprehensive income, end of year
 
$
(3.3
)
 
$
(3.1
)