Acquisitions - Narrative (Details) $ in Millions		1 Months Ended			12 Months Ended
	Nov. 01, 2019	Apr. 30, 2020 USD ($)	May 31, 2019 USD ($)	Jan. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) acquisition	Dec. 31, 2019 USD ($) acquisition	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Consideration transferred					$ 0.5
Goodwill, purchase accounting adjustments					8.4
Bargain purchase price gain					11.1	$ 0.0	$ 0.0
Cash paid for acquisitions, net of cash acquired					24.0	226.5	$ 765.4
Goodwill, other					$ 45.5	$ (12.9)
2020 Acquisitions
Business Acquisition [Line Items]
Number of acquisitions | acquisition					1
Consideration transferred					$ 17.8
Working capital adjustment related to 2018 acquisitions paid in 2019					0.0
Bargain purchase price gain					11.1
Cash paid for acquisitions, net of cash acquired					24.0
Aurora
Business Acquisition [Line Items]
Revenue reported by acquired entity					$ 30.0
2019 Acquisitions
Business Acquisition [Line Items]
Number of acquisitions | acquisition						2
Working capital adjustment related to 2018 acquisitions paid in 2019						$ 2.9
Bargain purchase price gain						0.0
Cash paid for acquisitions, net of cash acquired						226.5
Purchase price adjustments			$ 4.8
Goodwill, other						$ 1.9
BEKA
Business Acquisition [Line Items]
Effective date of acquisition	Nov. 01, 2019
Working capital adjustment related to 2018 acquisitions paid in 2019		$ 6.7
Cone Drive
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired				$ 2.9