Earnings Per Unit - Summary of Computation of Basic and Diluted Earnings Per Limited Partner Unit (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) from continuing operations	$ 3.6	$ (16.8)	$ (10.8)	$ (0.4)
General partner’s interest in net loss from continuing operations	0.1	(0.3)	(0.2)	0.0
Net income (loss) available to limited partners	$ 3.5	$ (16.5)	$ (10.6)	$ (0.4)
Denominator [Abstract]
Basic and Diluted	78,664,183	78,212,837	78,532,405	78,111,857
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	14,787	0	0	0
Basic Units [Abstract]
Limited partners’ interest	$ 0.05	$ (0.21)	$ (0.13)	$ 0
Diluted Units [Abstract]
From continuing operations	0.05	(0.21)	(0.13)	0.00
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Diluted	0.00	0.00	0.00	0.00
Limited partners' interest	$ 0.05	$ (0.21)	$ (0.13)	$ 0
Weighted Average Number of Shares Outstanding, Diluted	78,678,970	78,212,837	78,532,405	78,111,857
Dilutive phantom units excluded (in shares)	0	100,000	0	100,000
Continuing Operations
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
General partner’s interest in net loss from continuing operations	$ 0.1	$ (0.3)	$ 0.2	$ 0.0