Acquisition - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Apr. 01, 2020	Jun. 30, 2020	Dec. 31, 2019
Allocation of consideration to assets acquired and liabilities assumed:
Goodwill		$ 379.8	$ 253.2
SCI Acquisition
Business Acquisition [Line Items]
Total purchase consideration	$ 196.7
Allocation of consideration to assets acquired and liabilities assumed:
Cash and cash equivalents	2.9
Accounts receivable	3.6
Prepaid expenses and other current assets	1.1
Property, equipment and software	0.3
Operating lease right-of-use assets	1.2
Intangible assets	84.3
Goodwill	126.6
Accounts payable	(0.2)
Current portion of customer liabilities	(4.6)
Accrued compensation and benefits	(1.9)
Current portion of operating lease liabilities	(0.5)
Other accrued expenses	(0.3)
Non-current portion of operating lease liabilities	(0.7)
Other non-current liabilities	(5.0)
Deferred income tax liabilities	(10.1)
Net assets acquired	$ 196.7