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Debt and Redeemable Preferred Stock - Schedule of Contractual Maturities of Long Term Debt (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Debt and Redeemable Preferred Stock  
2018 $ 3.6
2019 3.1
2020 1.0
2021 0.2
2022 0.1
Total $ 8.0