Commitments and Contingencies - Commitments (Details) $ in Millions	Jun. 30, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Purchase obligation	$ 609.4
Accrued estimate carrying charges or obsolete materials charges	$ 24.1

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

No definition available.