Business Combination (Details) - USD ($)	Apr. 13, 2016	Apr. 28, 2016
Business Acquisition [Line Items]
Accumulated Depreciation	$ 0
Deferred Tax Liabilities, Goodwill	0
Preliminary Purchase Price Allocation [Abstract]
Current assets	455,016,000
Property, plant, and equipment, net	3,432,144,000
Goodwill	1,490,402,000
Other long-term assets	1,003,255,000
Current liabilities	228,515,000
Net deferred income tax liabilities	1,060,487,000
Other liabilities	258,204,000
Long-term debt, net	1,470,126,000
Total purchase price	3,363,485,000
Property, Plant and Equipment [Member]
Preliminary Fair Value Adjustments [Abstract]
Assets	(1,334,932,000)
Accumulated Depreciation [Member]
Preliminary Fair Value Adjustments [Abstract]
Assets	1,565,776,000
Goodwill [Member]
Preliminary Fair Value Adjustments [Abstract]
Assets	1,490,402,000
Intangible Assets [Member]
Preliminary Fair Value Adjustments [Abstract]
Assets	93,251,000
Regulatory Asset [Member]
Preliminary Fair Value Adjustments [Abstract]
Assets	228,752,000
Other Noncurrent Liabilities [Member] | Deferred Tax Liabilities [Member]
Preliminary Fair Value Adjustments [Abstract]
Liabilities	127,401,000
Other Noncurrent Liabilities [Member] | Long-term Debt [Member]
Preliminary Fair Value Adjustments [Abstract]
Liabilities	$ 198,599,000
Merger Commitments, rate credits [Member] | LPSC [Member]
Business Acquisition [Line Items]
Merger Commitments		$ 136,000,000
Merger Commitments, economic development contribution [Member] | LPSC [Member]
Business Acquisition [Line Items]
Merger Commitments		7,000,000
Merger Commitments, charitable contribution, over 5 years [Member] | LPSC [Member]
Business Acquisition [Line Items]
Merger Commitments		6,000,000
Merger Commitments, economic development contribution, annually for 5 years [Member] | LPSC [Member]
Business Acquisition [Line Items]
Merger Commitments		2,500,000
Merger Commitments, cost savings [Member] | LPSC [Member]
Business Acquisition [Line Items]
Merger Commitments		1,200,000
Parent Company [Member]
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)	$ 1.00
Share price at the time of the Merger (in dollars per share)	$ 55.37
Purchase Price Consideration	$ 3,360,000,000
Preliminary Purchase Price Allocation [Abstract]
Goodwill	1,490,000,000
Parent Company [Member] | Cash Paid to Cleco shareholders [Member]
Business Acquisition [Line Items]
Purchase Price Consideration, Cash Paid	3,350,000,000
Parent Company [Member] | Cash Paid for Cleco LTIP equity awards [Member]
Business Acquisition [Line Items]
Purchase Price Consideration, Cash Paid	$ 9,500,000
Cleco Power [Member] | Merger Commitments, rate credits [Member] | LPSC [Member]
Business Acquisition [Line Items]
Merger Commitments		136,000,000
Cleco Power [Member] | Merger Commitments, economic development contribution [Member] | LPSC [Member]
Business Acquisition [Line Items]
Merger Commitments		7,000,000
Cleco Power [Member] | Merger Commitments, charitable contribution, over 5 years [Member] | LPSC [Member]
Business Acquisition [Line Items]
Merger Commitments		6,000,000
Cleco Power [Member] | Merger Commitments, economic development contribution, annually for 5 years [Member] | LPSC [Member]
Business Acquisition [Line Items]
Merger Commitments		2,500,000
Cleco Power [Member] | Merger Commitments, cost savings [Member] | LPSC [Member]
Business Acquisition [Line Items]
Merger Commitments		$ 1,200,000
Non-vested Stock [Member]
Business Acquisition [Line Items]
Remaining LTIP equity awards	0