Partnership Units and Related Matters (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		0 Months Ended	1 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Feb. 27, 2015	Apr. 30, 2015
Partnership Equity [Abstract]
General partner ownership interest (in hundredths)	2.00%
Number of days from end of each quarter by when cash is distributed to unit holders	45 days
Distributions Declared [Member]
Partnership Equity [Abstract]
Date paid or to be paid	May 15, 2015
Distributions to limited partners common	148.3
Distributions to general partners (Incentive distribution rights)	41.7
Distributions to general partner (2%)	3.9
Total distributions to general and limited partners	193.9
Distributions to Targa Resources Corp.	59.0
Distributions per limited partner unit (in dollars per unit)	0.8200
Distributions Paid [Member]
Partnership Equity [Abstract]
Date paid or to be paid		Feb. 13, 2015
Distributions to limited partners common		96.3
Distributions to general partners (Incentive distribution rights)		38.4
Distributions to general partner (2%)		2.7
Total distributions to general and limited partners		137.4
Distributions to Targa Resources Corp.		51.6
Distributions per limited partner unit (in dollars per unit)		$ 0.8100
Atlas Pipeline Partners [Member]
Partnership Equity [Abstract]
Number of common units included in public offerings (in shares)			58,614,157
General partner ownership interest (in hundredths)			2.00%
Atlas Pipeline Partners [Member] | Atlas Energy [Member]
Partnership Equity [Abstract]
Number of common units included in public offerings (in shares)			3,363,935
May 2014 EDA [Member]
Partnership Equity [Abstract]
Number of common units included in public offerings (in shares)	1,271,876
Dollar amount of common units able to sell from equity distribution agreement	400.0
Net proceeds from public offering	53.0
Commissions to sales agents, maximum (in hundredths)	1.00%
Amount contributed to maintain general partner ownership percentage	1.1
General partner ownership interest (in hundredths)	2.00%
May 2014 EDA [Member] | Subsequent Event [Member]
Partnership Equity [Abstract]
Number of common units included in public offerings (in shares)				2,318,950
Proceeds from public offering, net of commissions				100.1
Net proceeds from public offering				24.8
Amount contributed to maintain general partner ownership percentage				2.1
Amount received to maintain general partner ownership percentage				0.8
General partner ownership interest (in hundredths)				2.00%
Amount which remain available under the shelf agreement				$ 4.2