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Leases - Narrative (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Leases [Abstract]  
Commitments under leases under ASU 840, 2019 $ 55.1
Commitments under leases under ASU 840, 2020 104.4
Commitments under leases under ASU 840, 2021 104.4
Commitments under leases under ASU 840, 2022 97.6
Commitments under leases under ASU 840, 2023 97.6
Commitments under leases under ASU 840, thereafter $ 168.5