Acquisitions - Summary of Consideration Transferred and Allocation of Purchase Price to Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions			3 Months Ended	12 Months Ended			14 Months Ended		17 Months Ended
	Aug. 01, 2019	Aug. 01, 2018	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2020
Business Acquisition [Line Items]
Total consideration transferred				$ (1.2)	$ 452.8	$ 68.4
Assets:
Goodwill				2,222.6	$ 2,216.9	$ 1,947.6			$ 2,222.6
APS
Measurement Period Adjustments
Consideration transferred			$ 4.3
Property and equipment, net	$ 2.4
Protective | APS
Business Acquisition [Line Items]
Total consideration transferred	445.7								441.4
Assets:
Cash and cash equivalents	16.0						$ 15.8
Trade receivables, net	37.3						37.3
Other receivables	0.3						0.3
Inventories, net	40.7						40.0
Prepaid expenses and other current assets	2.3						2.3
Property and equipment, net	76.9						85.6
Identifiable intangible assets, net	81.1			80.5			80.5		80.5
Goodwill	261.3						246.7
Operating lease right-of-use-assets							4.3
Other non-current assets	24.7						25.8
Total assets	540.6						538.6
Liabilities:
Accounts payable	12.0						12.0
Current portion of long-term debt	2.6						2.1
Current portion of operating lease liabilities							1.5
Other current liabilities	56.2						52.9
Long-term debt, less current portion	4.3						4.0
Long-term operating lease liabilities, less current portion							2.8
Deferred taxes							0.5
Other non-current liabilities	19.8						21.4
Total liabilities	$ 94.9						97.2
Measurement Period Adjustments
Consideration transferred							(4.3)
Cash and cash equivalents							(0.2)
Inventories, net							(0.7)
Property and equipment, net							8.7
Identifiable intangible assets, net							(0.6)
Goodwill							(14.6)
Operating lease right-of-use-assets							4.3
Other non-current assets							1.1
Total assets							(2.0)
Current portion of long-term debt							(0.5)
Current portion of operating lease liabilities							1.5
Other current liabilities							(3.3)
Long-term debt, less current portion							(0.3)
Long-term operating lease liabilities, less current portion							2.8
Deferred taxes							0.5
Other non-current liabilities							1.6
Total liabilities							$ 2.3
Protective | AFP
Business Acquisition [Line Items]
Total consideration transferred		$ 70.8						$ 74.1
Assets:
Cash and cash equivalents		2.9						3.3
Trade receivables, net		30.8						30.8
Inventories, net		7.1						7.1
Prepaid expenses and other current assets		0.7						0.7
Property and equipment, net		3.5						3.1
Identifiable intangible assets, net		18.6		$ 19.3				19.3	$ 19.3
Goodwill		21.6						22.6
Other non-current assets		0.7						0.3
Total assets		85.9						87.2
Liabilities:
Accounts payable		13.8						11.6
Current portion of long-term debt		0.0						0.1
Other current liabilities		1.3						1.2
Long-term debt, less current portion		0.0						0.2
Total liabilities		$ 15.1						13.1
Measurement Period Adjustments
Consideration transferred								(3.3)
Cash and cash equivalents								0.4
Property and equipment, net								(0.4)
Identifiable intangible assets, net								0.7
Goodwill								1.0
Other non-current assets								(0.4)
Total assets								1.3
Current portion of long-term debt								0.1
Accounts payable								(2.2)
Other current liabilities								(0.1)
Long-term debt, less current portion								0.2
Total liabilities								$ (2.0)