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Commitments and Contingencies, Additional Lease Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Lease Accounting Standard [Abstract] |  |
Operating lease income | $ 4.8 |
Maximum [Member] |  |
Lease Accounting Standard [Abstract] |  |
Percentage of revenues from operating lease income | 1.00% |
Percentage of operating expense from operating lease expense | 1.00% |
ASC 842 [Member] |  |
Lease Accounting Standard [Abstract] |  |
Right-of-use assets |  | $ 246.1
Lease liabilities |  | $ 246.1
ASC 842 [Member] | Maximum [Member] |  |
Lease Accounting Standard [Abstract] |  |
Percentage impact of adopting new accounting pronouncement on total assets |  | 1.00%
Percentage impact of adopting new accounting pronouncement on total liabilities |  | 1.00%

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- Definition Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919372-209981 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77888421&loc=SL77919311-209978 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=109225645&loc=SL77927221-108306 + Details
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