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Basis of Preparation (Tables) | 6 Months Ended
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Jun. 30, 2019
Accounting Policies [Abstract] |
Operating Lease Future Minimum Lease Payments | The following table summarizes future minimum lease payments for non-cancelable operating leases as of June 30, 2019 and December 31, 2018:
| June 30, 2019 |  | December 31, 2018
2019 (1) | $ | 3.5 |  |  | $ | 7.9 |
2020 | 6.3 |  |  | 6.9 |
2021 | 5.6 |  |  | 5.7 |
2022 | 5.3 |  |  | 5.3 |
2023 | 4.6 |  |  | 4.6 |
Thereafter (2) | 9.2 |  |  | 9.2 |
Total future minimum lease payments | $ | 34.5 |  |  | $ | 39.6 |
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(1) | Amount as of June 30, 2019 represents lease payments for the remaining six months, July 2019 through December 2019.
(2) As of June 30, 2019, future minimum lease payments for non-cancelable operating leases for period subsequent to 2023 relate to 11 leased facilities.

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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