Acquisitions - Business Combination Transfer Purchase Price Consideration (Details) - Mountain Valley Acquisition - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Feb. 28, 2019	Oct. 31, 2018	Dec. 29, 2018
Business Acquisition [Line Items]
Cash paid to sellers			$ 62.5
Cash paid on behalf of sellers for sellers’ transaction expenses			1.8
Cash paid to retire outstanding debt on behalf of sellers			$ 16.1
Working capital settlement	$ (0.4)
Total consideration	$ 80.0	$ 80.4