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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2014
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
2015
$
130.7

2016
$
120.6

2017
$
120.0

2018
$
117.1

2019
$
112.0

After 2019
$
407.4

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 are as follows (in millions):
 
Year
Amount
2015
$
8.4

2016
$
8.2

2017
$
8.4

2018
$
6.9

2019
$
6.8

After 2019
$
23.9