Goodwill and Other Intangible Assets - Net - Other Intangible Assets, Net (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets, Net [Abstract]
Gross	$ 70.4	$ 71.8
Accumulated Amortization	43.3	40.7
Total	$ 27.1	$ 31.1
Developed Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	4 years	4 years
Finite-Lived Intangible Assets, Net [Abstract]
Gross	$ 48.8	$ 50.2
Accumulated Amortization	25.8	24.6
Total	$ 23.0	$ 25.6
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	4 years 1 month 6 days	4 years 1 month 6 days
Finite-Lived Intangible Assets, Net [Abstract]
Gross	$ 21.6	$ 21.6
Accumulated Amortization	17.5	16.1
Total	$ 4.1	$ 5.5