Other Current Liabilities - Level 4 Tag - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Deferred revenue (Note 10)	$ 88.2	$ 82.8
Accrued legal and regulatory	60.5	30.4
Accrued payroll	57.5	110.6
Income taxes payable	43.2	14.9
Accrued employee benefits	26.5	35.4
Operating lease liabilities	19.0	19.9
Accrued interest	5.0	4.0
Contingent consideration (Note 2)	0.0	7.2
Other	28.6	31.3
Total other current liabilities	$ 328.5	$ 336.5