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Commitments and Contingencies - Leases (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) lease | Sep. 30, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Number of leases that require rent to be paid based on contingent events | lease |  |  | 0 |
Rent expense | $ | $ 7.5 | $ 6.7 | $ 21.9 | $ 20.1

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- Definition Represents the number of leases that require rent to be paid based on contingent events. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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