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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets and Liabilities - Finite-Lived Intangible Assets and Liabilities Narrative (Details) | 6 Months Ended
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Jun. 30, 2018
Customer Relationships | Minimum |
Finite-Lived Intangible Assets |
Amortization period | 10 years
Customer Relationships | Maximum |
Finite-Lived Intangible Assets |
Amortization period | 30 years
Customer inducements | Minimum |
Finite-Lived Intangible Assets |
Amortization period | 10 years
Customer inducements | Maximum |
Finite-Lived Intangible Assets |
Amortization period | 30 years
Customer Inducements, Current Record Management Vendor Or Payments To Customers [Member] | Minimum |
Finite-Lived Intangible Assets |
Amortization period | 5 years
Customer Inducements, Current Record Management Vendor Or Payments To Customers [Member] | Maximum |
Finite-Lived Intangible Assets |
Amortization period | 15 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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