Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Jul. 01, 2021	Sep. 30, 2021	Dec. 31, 2020
Allocation of consideration to assets acquired and liabilities assumed:
Goodwill		$ 551.9	$ 375.3
VisitPay
Business Acquisition [Line Items]
Total purchase consideration	$ 305.4
Allocation of consideration to assets acquired and liabilities assumed:
Cash and cash equivalents	10.7
Accounts receivable	4.7
Prepaid expenses and other current assets	0.4
Property, equipment and software	0.3
Operating lease right-of-use assets	1.7
Deferred income tax assets	0.9
Intangible assets	117.3
Goodwill	176.4
Accounts payable	(0.5)
Current portion of customer liabilities	(1.1)
Accrued compensation and benefits	(0.7)
Current portion of operating lease liabilities	(0.4)
Other accrued expenses	(2.0)
Non-current portion of customer liabilities	(1.0)
Non-current portion of operating lease liabilities	(1.3)
Net assets acquired	$ 305.4