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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | 6. EMPLOYEE BENEFIT PLANS The components of net periodic benefit cost (credit) are as follows:
|  | Pension Benefits
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
|  | (in millions)
Service cost |  | $ | 0.8 |  |  | $ | 0.9 |  |  | $ | 2.4 |  |  | $ | 2.7 |
Interest cost |  | 7.2 |  |  | 9.0 |  |  | 21.6 |  |  | 27.0 |
Expected asset return |  | (10.6 | ) |  | (12.1 | ) |  | (31.8 | ) |  | (36.3 | )
Amortized loss |  | 1.5 |  |  | 1.3 |  |  | 4.5 |  |  | 3.9 |
Net periodic benefit credit |  | $ | (1.1 | ) |  | $ | (0.9 | ) |  | $ | (3.3 | ) |  | $ | (2.7 | )
|  | Other Postretirement Benefits
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
|  | (in millions)
Service cost |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.3 |  |  | $ | 0.3 |
Interest cost |  | 3.8 |  |  | 3.8 |  |  | 11.4 |  |  | 11.4 |
Amortized loss |  | 0.2 |  |  | 0.2 |  |  | 0.6 |  |  | 0.6 |
Amortized prior service credit |  | (0.7 | ) |  | (0.7 | ) |  | (2.1 | ) |  | (2.1 | )
Net periodic benefit cost |  | $ | 3.4 |  |  | $ | 3.4 |  |  | $ | 10.2 |  |  | $ | 10.2 |
Due to the availability of our prefunding balances (previous contributions in excess of prior required pension contributions), we are not required to make any cash payments in 2015. We expect our cash payments for other postretirement benefit obligations in 2015, net of GM cost sharing, to be approximately $16 million.

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