Background and Summary of Significant Accounting Policies - Goodwill, Customer Relationships and Other Intangible Assets (Details)		12 Months Ended
Oct. 31, 2017 reporting_unit	Dec. 31, 2019 reporting_unit segment
Goodwill, Customer Relationships and Other Intangible Assets
Number of reporting units \| reporting_unit	1	1
Number of operating segments \| segment		1
Customer relationships
Goodwill, Customer Relationships and Other Intangible Assets
Finite-lived intangible assets, maximum useful life		10 years
Capitalized software
Goodwill, Customer Relationships and Other Intangible Assets
Finite-lived intangible assets, maximum useful life		7 years

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

No definition available.

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration