Segment Results (Details) $ in Millions				3 Months Ended			9 Months Ended
		Aug. 17, 2017 USD ($)	May 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)		Sep. 30, 2017 USD ($) Segment	Sep. 30, 2016 USD ($)
Segment Results [Abstract]
Number of reportable segments | Segment							3
Segment Reporting Information [Line Items]
Revenue				$ 649.6	$ 462.6		$ 1,710.4	$ 1,361.6
Less items to reconcile Segment Adjusted EBITDA to Income (Loss) Before Income Taxes [Abstract]
Interest expense				30.1	43.0		115.4	128.7
Restructuring and related business transformation costs				6.3	18.2		20.5	46.2
Stock-based compensation	[1]			9.8	0.0		166.0	0.0
Loss on extinguishment of debt		$ 34.1	$ 50.4	34.1	0.0		84.5	0.0
Income (Loss) Before Income Taxes				32.4	(22.1)		(166.3)	(60.3)
Restructuring and Related Business Transformation Costs [Abstract]
Restructuring charges	[2]			2.8	3.0		4.9	15.4
Severance, sign-on, relocation and executive search costs				0.6	5.7		2.2	12.7
Facility reorganization, relocation and other costs				1.0	2.9		3.9	6.5
Information technology infrastructure transformation				0.8	0.6		3.4	1.0
(Gains) losses on asset and business disposals				(0.6)	1.7		2.0	1.6
Consultant and other advisor fees				0.5	3.2		1.7	6.9
Other, net				1.2	1.1		2.4	2.1
Restructuring and related business transformation costs				6.3	18.2		20.5	46.2
KKR [Member]
Less items to reconcile Segment Adjusted EBITDA to Income (Loss) Before Income Taxes [Abstract]
Monitoring agreement termination fee				16.2
2013 Stock Incentive Plan [Member] | Stock Options [Member]
Restructuring and Related Business Transformation Costs [Abstract]
Stock-based compensation expense recognized				7.8			69.2
2013 Stock Incentive Plan [Member] | Deferred Stock Units [Member]
Restructuring and Related Business Transformation Costs [Abstract]
Stock-based compensation expense recognized				2.0			96.8
Operating Segments [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA				178.5	94.2	[3]	419.8	271.1	[3]
Operating Segments [Member] | Industrials [Member]
Segment Reporting Information [Line Items]
Revenue				288.2	265.6	[3]	819.0	803.6	[3]
Adjusted EBITDA				63.1	55.6	[3]	173.7	156.2	[3]
Operating Segments [Member] | Energy [Member]
Segment Reporting Information [Line Items]
Revenue				301.6	137.9	[3]	719.4	385.8	[3]
Adjusted EBITDA				98.6	22.0	[3]	199.2	70.2	[3]
Operating Segments [Member] | Medical [Member]
Segment Reporting Information [Line Items]
Revenue				59.8	59.1	[3]	172.0	172.2	[3]
Adjusted EBITDA				16.8	16.6	[3]	46.9	44.7	[3]
Corporate [Member]
Less items to reconcile Segment Adjusted EBITDA to Income (Loss) Before Income Taxes [Abstract]
Corporate expenses not allocated to segments				13.8	5.2	[3]	30.9	18.8	[3]
Segment Reconciling Items [Member]
Less items to reconcile Segment Adjusted EBITDA to Income (Loss) Before Income Taxes [Abstract]
Interest expense				30.1	43.0	[3]	115.4	128.7	[3]
Depreciation and amortization expenses				43.5	42.9	[3]	126.9	126.9	[3]
Impairment of goodwill and other intangible assets	[4]			0.0	0.0	[3]	0.0	1.5	[3]
Sponsor fees and expenses	[5]			0.0	1.8	[3]	17.3	3.8	[3]
Restructuring and related business transformation costs				6.3	18.2	[3]	20.5	46.2	[3]
Acquisition related expenses and non-cash charges	[6]			1.2	1.9	[3]	3.1	3.6	[3]
Environmental remediation loss reserve	[7]			0.0	0.0	[3]	0.9	0.0	[3]
Expenses related to initial stock offering	[8]			0.5	0.0	[3]	3.6	0.0	[3]
Establishment of public company financial reporting compliance	[9]			3.8	0.1	[3]	7.2	0.1	[3]
Stock-based compensation	[1]			9.8	0.0	[3]	166.0	0.0	[3]
Loss on extinguishment of debt	[10]			34.1	0.0	[3]	84.5	0.0	[3]
Other adjustments	[11]			3.0	3.2	[3]	9.8	1.8	[3]
Restructuring and Related Business Transformation Costs [Abstract]
Restructuring and related business transformation costs				$ 6.3	$ 18.2	[3]	$ 20.5	$ 46.2	[3]

[1] Represents stock-based compensation expense recognized for stock options outstanding for the three months and nine months ended September 30, 2017 of $7.8 million and $69.2 million, respectively, and DSUs granted to employees at the date of the initial public offering for the three months and nine months ended September 30, 2017 of $2.0 million and $96.8 million, respectively. See Note 9 "Stock-Based Compensation".

[2] See Note 3 "Restructuring."

[3] In the fourth quarter of fiscal 2016, the Company modified its methodology for presenting reconciling items from Income (Loss) Before Income Taxes. The reconciling items for the three and nine month periods ended September 30, 2016 have been restated to conform to the methodology used in the three and nine month periods ended September 30, 2017, and included the following:

[4] Represents non-cash charges for impairment of goodwill and other intangible assets.

[5] Represents management fees and expenses paid to KKR, including a monitoring agreement termination fee of $16.2 million paid in the three month period ending June 30, 2017.

[6] Represents costs associated with successful and/or abandoned acquisitions, including third-party expenses, post-closure integration costs and non-cash charges and credits arising from fair value purchase accounting adjustments.

[7] Represents estimated environmental remediation costs and losses relating to a former production facility.

[8] Represents expenses related to the Company's initial public offering.

[9] Represents third party expenses to comply with the requirements of Sarbanes-Oxley in 2018 and the accelerated adoption of the new revenue recognition standard (ASC 606 - Revenue from Contracts with Customers) in the first quarter of 2018, one year ahead of the required adoption date for a private company. These expenses were previously included in 'Expenses related to initial stock offering' and prior periods have been restated to conform to current period presentation.

[10] Represents losses on extinguishment of debt recognized on the redemption of the senior notes and pay down of a portion of the Original Dollar Term Loan Facility with proceeds from the initial public offering in May 2017($50.4 million) and in connection with the refinancing of the Original Dollar Term Loan Facility and Euro Term Loan Facility in August 2017 ($34.1 million).

[11] Includes (i) foreign exchange gains and losses, (ii) effects of amortization of prior service costs and amortization of gains in pension and other postretirement benefits (OPEB) expense, (iii) certain legal and compliance costs and (iv) other miscellaneous adjustments.