Goodwill and Other Intangible Assets - Net - Other Intangible Assets, Net (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets, Net [Abstract]
Gross	$ 70.4	$ 71.8
Accumulated Amortization	47.0	40.7
Total	$ 23.4	$ 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	28.2	24.6
Total	$ 20.6	$ 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	18.8	16.1
Total	$ 2.8	$ 5.5