Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 1,392.7	$ 1,316.5
Accumulated Amortization	(552.7)	(441.7)
Net Book Value	840.0	874.8
Customer lists
Finite-Lived Intangible Assets
Gross Carrying Amount	959.1	927.8
Accumulated Amortization	(351.4)	(283.2)
Net Book Value	607.7	644.6
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	380.5	381.3
Accumulated Amortization	(194.8)	(155.6)
Net Book Value	185.7	225.7
Trade name
Finite-Lived Intangible Assets
Gross Carrying Amount	51.5	5.9
Accumulated Amortization	(4.9)	(1.6)
Net Book Value	46.6	4.3
Non-compete agreement
Finite-Lived Intangible Assets
Gross Carrying Amount	1.6	1.5
Accumulated Amortization	(1.6)	(1.3)
Net Book Value	$ 0.0	$ 0.2