Selected Balance Sheet Data Accounts Receivable, Net (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Accounts receivable, net
Accounts receivable	$ 117.9	$ 98.0
Less allowance for bad debts	(7.1)	(5.3)
Accounts receivable, net	$ 110.8	$ 92.7

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant