Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Summary of quarterly financial data

Summarized quarterly financial data are as follows:

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Full Year
	(in millions, except per unit amounts)
2016
Net sales	$	108.0	$	126.7	$	90.2	$	93.4	$	418.3
Gross margin	43.1		102.7		32.8		48.2		226.8
Net earnings	37.7		98.7		28.8		44.1		209.3
Net earnings per Common Unit(1)	1.44		3.22		1.04		1.85		7.56
2015
Net sales	$	126.6	$	153.6	$	150.2	$	151.3	$	581.7
Gross margin	65.0		103.7		74.1		83.0		325.8
Net earnings	59.0		99.3		69.4		79.2		306.9
Net earnings per Common Unit(1)	2.03		3.31		2.23		2.49		10.06