Property, Plant and Equipment and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

Property Plant And Equipment And Intangible Assets [Abstract]

Property Plant and Equipment and Intangible Assets

	March 31, 2018			December 31, 2017			Estimated Useful Lives (In Years)
Gathering systems	$	7,154.3		$	7,037.2		5 to 20
Processing and fractionation facilities		3,685.0			3,569.6		5 to 25
Terminaling and storage facilities		1,252.3			1,244.1		5 to 25
Transportation assets		343.6			343.6		10 to 25
Other property, plant and equipment		312.2			303.7		3 to 25
Land		144.4			125.7		—
Construction in progress		1,877.0			1,581.5		—
Property, plant and equipment		14,768.8			14,205.4
Accumulated depreciation		(3,927.2	)		(3,775.4	)
Property, plant and equipment, net	$	10,841.6		$	10,430.0
Intangible assets	$	2,736.6		$	2,736.6		10 to 20
Accumulated amortization		(616.5	)		(570.8	)
Intangible assets, net	$	2,120.1		$	2,165.8

Schedule of Changes in Intangible Assets

The changes in our intangible assets are as follows:

Balance at December 31, 2017	$	2,165.8
Amortization		(45.7	)
Balance at March 31, 2018	$	2,120.1