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Commitments and Contingencies - Convertible Senior Notes (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Remainder of 2018 $ 0.6
2019 1.1
2020 1.1
2021 1.1
2022 1.1
Thereafter 451.7
Net carrying amount of the liability component $ 456.7