Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities:
Net earnings	$ 153.9	$ 209.3	$ 306.9
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	39.0	40.4	35.8
Unrealized loss (gain) on derivatives	10.6	(35.3)	24.3
Loss on disposal of property, plant and equipment	0.0	0.1	2.0
Gain on sale of equity method investment	(14.3)	0.0	0.0
Changes in operating assets and liabilities:
Accounts receivable	(0.3)	0.2	(0.4)
Inventories	3.3	2.0	(1.1)
Accounts payable and accrued expenses	(0.9)	2.5	(6.7)
Due to/from affiliates of the General Partner	(13.0)	6.0	15.1
Other assets and liabilities	(0.8)	(1.7)	(0.8)
Net cash provided by operating activities	177.5	223.5	375.1
Investing Activities:
Additions to property, plant and equipment	(27.2)	(33.1)	(87.8)
Proceeds from Sale of Property, Plant, and Equipment	0.0	0.2	0.9
Proceeds from sale of equity method investment	16.3	0.0	0.0
Net cash used in investing activities	(10.9)	(32.9)	(86.9)
Financing Activities:
Net cash used in financing activities	(124.6)	(257.5)	(294.8)
Increase (decrease) in cash and cash equivalents	42.0	(66.9)	(6.6)
Cash and cash equivalents at beginning of year	39.5	106.4	113.0
Cash and cash equivalents at end of year	81.5	39.5	106.4
Declared and paid partnership distributions	$ 124.6	$ 257.5	$ 294.8