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Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Defined Contribution Plan Disclosures [Table Text Block] The following table sets forth the net periodic benefit cost for the Company’s other postretirement benefit plans. The amounts for the three and six months ended June 30, 2017 are based on calculations prepared by the Company's actuaries and represent the Company’s best estimate of each period’s proportionate share of the amounts to be recorded for the year ending December 31, 2017.
 
Three Months Ended
June 30,
Six Months Ended
June 30,
 
2017
2016
2017
2016
Components of net periodic benefit cost:
 
 
 
 
Service cost
$
0.1

$
0.1

$
0.1

$
0.2

Interest cost
2.2

2.8

4.5

5.5

Expected return on plan assets
(1.4
)
(1.7
)
(2.8
)
(3.3
)
Amortization of prior service cost
(0.3
)
0.3

(0.5
)
0.5

Net periodic benefit cost
$
0.6

$
1.5

$
1.3

$
2.9