Restructuring Activities - Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Reserve
Beginning balance, restructuring accrual	$ 1.9	$ 6.6	$ 2.8	$ 7.3
Restructuring costs	0.6	5.0	1.5	9.6
Cash payments and other	(2.2)	(7.4)	(3.3)	(12.7)
Change in estimates			(0.7)
Ending balance, restructuring accrual	0.3	4.2	0.3	4.2
Operating Segments | Energy & Chemicals
Restructuring Reserve
Beginning balance, restructuring accrual	0.2	0.0	0.2	0.1
Restructuring costs	0.2	1.6	0.4	2.1
Cash payments and other	(0.4)	(1.6)	(0.6)	(2.2)
Change in estimates			0.0
Ending balance, restructuring accrual	0.0	0.0	0.0	0.0
Operating Segments | Distribution & Storage
Restructuring Reserve
Beginning balance, restructuring accrual	0.1	2.3	1.2	2.9
Restructuring costs	0.3	0.3	0.5	0.4
Cash payments and other	(0.3)	(0.7)	(0.9)	(1.4)
Change in estimates			(0.7)
Ending balance, restructuring accrual	0.1	1.9	0.1	1.9
Operating Segments | BioMedical
Restructuring Reserve
Beginning balance, restructuring accrual	0.2	1.4	0.3	1.3
Restructuring costs	0.0	1.4	0.0	4.0
Cash payments and other	0.0	(2.0)	(0.1)	(4.5)
Change in estimates			0.0
Ending balance, restructuring accrual	0.2	0.8	0.2	0.8
Corporate
Restructuring Reserve
Beginning balance, restructuring accrual	1.4	2.9	1.1	3.0
Restructuring costs	0.1	1.7	0.6	3.1
Cash payments and other	(1.5)	(3.1)	(1.7)	(4.6)
Change in estimates			0.0
Ending balance, restructuring accrual	$ 0.0	$ 1.5	$ 0.0	$ 1.5