Segment Reporting - Segment Results (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting [Abstract]
Revenues	$ 4,910.2	$ 2,451.9	$ 2,689.8
Adjusted EBITDA	1,130.7	604.2	702.1
Less items to reconcile Segment Adjusted EBITDA to Income (Loss) Before Income Taxes [Abstract]
Interest expense	111.1	88.9	99.6
Impairment of other intangible assets	19.9	0.0	0.0
Restructuring and related business transformation costs	97.9	25.6	38.8
Acquisition related expenses and non-cash charges	97.3	53.8	9.8
Stock-based compensation	51.3	19.2	2.8
Loss on extinguishment of debt	2.0	0.2	1.1
Foreign currency transaction losses (gains), net	20.9	8.1	(1.9)
Shareholder litigation settlement recoveries	0.0	(6.0)	(9.5)
Income (Loss) Before Income Taxes	(19.4)	190.9	349.5
Insurance recoveries of legal defense costs			8.2
Depreciation of rental equipment	8.0
Restructuring Costs [Abstract]
Restructuring charges	92.9	17.1	12.7
Severance, sign-on, relocation and executive search costs	2.8	2.5	4.1
Facility reorganization, relocation and other costs	2.1	2.4	3.1
Information technology infrastructure transformation	0.0	1.2	0.8
Losses (gains) on asset and business disposals	0.0	0.8	(1.1)
Consultant and other advisor fees	0.0	0.3	14.1
Other, net	0.1	1.3	5.1
Total restructuring and related business transformation costs	97.9	25.6	38.8
Stock-based compensation expense recognized	51.3	19.2	2.8
Stock-based compensation expense related to stock option exercise	(0.5)
Decrease in stock-based compensation expense to DSU's		1.5
Total identifiable assets	16,058.6	4,628.4	4,487.1
Total capital expenditures	48.7	43.2	52.2
2013 Stock Incentive Plan
Restructuring Costs [Abstract]
Stock-based compensation expense recognized			3.8
2013 Stock Incentive Plan | Stock Options
Restructuring Costs [Abstract]
Stock-based compensation expense recognized			2.8
2013 Stock Incentive Plan | Deferred Stock Units
Restructuring Costs [Abstract]
Tax benefit related to DSUs granted			(5.6)
Industrial Technologies and Services
Segment Reporting [Abstract]
Revenues	3,248.2	1,700.9
Precision and Science Technologies
Segment Reporting [Abstract]
Revenues	725.0	316.6
Specialty Vehicle Technologies
Segment Reporting [Abstract]
Revenues	741.4	0.0
High Pressure Solutions
Segment Reporting [Abstract]
Revenues	195.6	434.4
Operating segments
Restructuring Costs [Abstract]
Total identifiable assets	14,299.9	4,101.6	4,258.9
Operating segments | Industrial Technologies and Services
Segment Reporting [Abstract]
Revenues	3,248.2	1,700.9	1,739.6
Adjusted EBITDA	759.8	391.4	393.6
Restructuring Costs [Abstract]
Total identifiable assets	9,113.4
Depreciation and amortization expense	314.3	123.9	128.3
Total capital expenditures	32.2	31.5	35.3
Operating segments | Precision and Science Technologies
Segment Reporting [Abstract]
Revenues	725.0	316.6	280.2
Adjusted EBITDA	220.2	95.8	80.7
Restructuring Costs [Abstract]
Total identifiable assets	2,852.8
Depreciation and amortization expense	106.3	26.2	23.9
Total capital expenditures	9.8	5.5	4.9
Operating segments | Specialty Vehicle Technologies
Segment Reporting [Abstract]
Revenues	741.4	0.0	0.0
Adjusted EBITDA	138.6	0.0	0.0
Restructuring Costs [Abstract]
Total identifiable assets	1,645.9	0.0	0.0
Depreciation and amortization expense	53.5	0.0	0.0
Total capital expenditures	2.9	0.0	0.0
Operating segments | High Pressure Solutions
Segment Reporting [Abstract]
Revenues	195.6	434.4	670.0
Adjusted EBITDA	12.1	117.0	227.8
Restructuring Costs [Abstract]
Total identifiable assets	687.8
Depreciation and amortization expense	26.8	28.0	28.2
Total capital expenditures	3.8	6.2	12.0
Operating segments | Industrials
Restructuring Costs [Abstract]
Total identifiable assets		2,729.7	2,806.6
Operating segments | Energy
Restructuring Costs [Abstract]
Total identifiable assets		558.4	570.0
Operating segments | Medical
Restructuring Costs [Abstract]
Total identifiable assets		813.5	882.3
Corporate expenses not allocated to segments
Less items to reconcile Segment Adjusted EBITDA to Income (Loss) Before Income Taxes [Abstract]
Operating Expenses	113.1	42.5	18.7
Restructuring Costs [Abstract]
Total identifiable assets	1,758.7	526.8	228.2
Segment reconciling items
Less items to reconcile Segment Adjusted EBITDA to Income (Loss) Before Income Taxes [Abstract]
Interest expense	111.1	88.9	99.6
Depreciation, Depletion and Amortization, Excluding Rental Equipment Depreciation	492.9	178.1	180.4
Impairment of other intangible assets	19.9	0.0	0.0
Restructuring and related business transformation costs	97.9	25.6	38.8
Acquisition related expenses and non-cash charges	233.2	54.6	16.7
Expenses related to public stock offerings	0.0	0.0	2.9
Establish public company financial reporting compliance	0.0	0.6	4.3
Stock-based compensation	50.8	20.7	(2.8)
Loss on extinguishment of debt	2.0	0.2	1.1
Foreign currency transaction losses (gains), net	20.9	8.1	(1.9)
Shareholder litigation settlement recoveries	0.0	(6.0)	(9.5)
Other adjustments	8.3	0.0	4.3
Restructuring Costs [Abstract]
Total restructuring and related business transformation costs	97.9	25.6	38.8
Depreciation and amortization expense	$ 500.9	$ 178.1	$ 180.4