Acquisitions - Schedule of Acquisition Related Expenses (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs, Legal Fees	$ 4.0	$ 1.0		$ 9.6
Business Combination, Acquisition Related Costs, Employee Expense	1.1	8.2		5.1
Business Combination, Acquisition Related Costs, Technology and Contract Termination	6.6	9.1		10.2
Business Combination, Acquisition Related Costs, Other Expenses	0.7	2.0		2.3
Total acquisition related expenses	$ 12.4	$ 20.3	$ 12.4	$ 27.2