Goodwill and Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	9 years 3 months 18 days	9 years 10 months 24 days
Gross Carrying Amount	$ 542.9	$ 542.9
Accumulated Amortization	$ 237.5	$ 204.1
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	9 years 3 months 18 days	10 years
Gross Carrying Amount	$ 503.8	$ 503.8
Accumulated Amortization	$ 211.4	$ 180.2
Trademarks and Trade Names
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	9 years 3 months 18 days	9 years 6 months
Gross Carrying Amount	$ 34.8	$ 34.8
Accumulated Amortization	$ 22.4	$ 20.6
Other Intangible Assets
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	1 year 4 months 24 days	2 years 1 month 6 days
Gross Carrying Amount	$ 4.3	$ 4.3
Accumulated Amortization	$ 3.7	$ 3.3