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Correction to previously issued financial statements - Segment Adjustments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales	$ 260.3	$ 245.4	$ 478.8	$ 445.0
Segment operating profits	57.1	49.2	97.0	88.5
Performance Materials
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales	89.5	74.2	172.9	144.3
Segment operating profits	30.7	26.2	60.2	56.9
Performance Chemicals
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales	170.8	171.2	305.9	300.7
Segment operating profits	$ 26.4	23.0	$ 36.8	31.6
As reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales		248.7		452.6
Segment operating profits		49.1		85.3
As reported | Performance Materials
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales		74.5		145.3
Segment operating profits		26.3		53.9
As reported | Performance Chemicals
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales		174.2		307.3
Segment operating profits		22.8		31.4
Increase/(decrease)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales		(3.3)		(7.6)	$ (9.4)	$ (5.5)
Segment operating profits		0.1		3.2
Increase/(decrease) | Performance Materials
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales		(0.3)		(1.0)
Segment operating profits		(0.1)		3.0
Increase/(decrease) | Performance Chemicals
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales		(3.0)		(6.6)
Segment operating profits		$ 0.2		$ 0.2

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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