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Basis of Preparation - Narratives (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) facility | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) facility | Sep. 30, 2018 USD ($) | Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |
Right of use assets | $ 34.9 |  | $ 34.9 |  |
Operating lease liability | 35.5 |  | 35.5 |  |
Operating lease liabilities, current | $ 6.8 |  | $ 6.8 |  |
Weighted average lease term | 6 years 10 months 24 days |  | 6 years 10 months 24 days |  |
Operating lease weighted average discount rate (percent) | 4.70% |  | 4.70% |  |
Operating lease rental expense | $ 2.7 | $ 2.0 | $ 6.8 | $ 6.2 |
Number of leased facilities (facility) | facility | 10 |  | 10 |  |
ASU 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |
Right of use assets |  |  |  |  | $ 34.8
Operating lease liability |  |  |  |  | $ 34.8

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