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Organization and Basis of Presentation - Accounting Standards Adopted (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jan. 01, 2019
Accounting Standards Adopted in 2019 |  |
Recognized lease liability on consolidated balance sheet | $ 48.3 |
Right-of-use asset on consolidated balance sheet | $ 47.4 |
Practical expedient, ASU No. 2016-02 | true |
ASU 2016-02 |  |
Accounting Standards Adopted in 2019 |  |
Recognized lease liability on consolidated balance sheet |  | $ 50.3
Right-of-use asset on consolidated balance sheet |  | $ 50.6
ASU 2018-15 |  |
Accounting Standards Adopted in 2019 |  |
Change in Accounting Principle, Accounting Standards Update, Early Adoption [true false] |  | true
Hosting arrangements that are service contracts | $ 3.5 |

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