Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 550.1	$ 366.0
Accumulated Amortization	(124.0)	(93.5)
Net Carrying Amount	426.1	272.5
Amortization of intangible assets	35.1	27.8	$ 17.7
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2021	36.4
2022	35.3
2023	34.9
2024	34.5
2025	33.9
Indefinite-lived trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7.8	8.2
Accumulated Amortization	0.0	0.0
Net Carrying Amount	7.8	8.2
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	509.0	322.3
Accumulated Amortization	(109.2)	(80.3)
Net Carrying Amount	$ 399.8	242.0
Weighted-average amortization period	12 years 2 months 12 days
Finite-lived trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 20.1	20.7
Accumulated Amortization	(9.1)	(7.1)
Net Carrying Amount	$ 11.0	13.6
Weighted-average amortization period	5 years 4 months 24 days
Amortization of intangible assets	$ 35.1	27.8
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8.6	8.7
Accumulated Amortization	(1.5)	(0.8)
Net Carrying Amount	$ 7.1	7.9
Weighted-average amortization period	9 years 6 months
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4.6	6.1
Accumulated Amortization	(4.2)	(5.3)
Net Carrying Amount	$ 0.4	$ 0.8
Weighted-average amortization period	2 years 7 months 6 days