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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
schedule of contributions by benefitplantype [Table Text Block]
, based on current actuarial calculations, to contribute the following to our pension plans, postretirement plans and Supplemental Executive Retirement Plan (“SERP”):
(in millions)
Pension
 
Postretirement
 
SERP
Expected contributions in 2019
$
3.1

 
$
0.7

 
$
2.2

Amounts contributed during the three months ended March 31, 2019
$
1.4

 
$
0.8

 
$
2.1