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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]
Annual payments and the corresponding years for gathering, processing, transportation, storage, drilling, and fractionation contracts are as follows (in millions):

Year
Amount
2016
$
126.4

2017
$
129.4

2018
$
111.8

2019
$
105.0

2020
$
87.8

After 2020
$
259.0

Operating Leases of Lessee Disclosure [Table Text Block]
Minimum future payments under the terms of long-term operating leases for the Company's primary office locations and utilities are as follows (in millions):
 
Year
Amount
2016
$
9.7

2017
$
9.8

2018
$
8.5

2019
$
7.6

2020
$
7.4

After 2020
$
18.6