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Commitments, Contingencies and Off-Balance Sheet Arrangements - Off-Balance Sheet Commitments (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2017
USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2017 $ 0.1
Amount of Commitment Expiration by Period - 2018 0.2
Amount of Commitment Expiration by Period - 2019 0.2
Amount of Commitment Expiration by Period - 2020 0.2
Amount of Commitment Expiration by Period - 2021 0.2
Amount of Commitment Expiration by Period - Thereafter 22.6
Total Amounts Committed 23.5
Letters of Credit [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - Thereafter 21.1
Total Amounts Committed 21.1
Financial Guarantees [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2017 0.1
Amount of Commitment Expiration by Period - 2018 0.2
Amount of Commitment Expiration by Period - 2019 0.2
Amount of Commitment Expiration by Period - 2020 0.2
Amount of Commitment Expiration by Period - 2021 0.2
Amount of Commitment Expiration by Period - Thereafter 1.1
Total Amounts Committed 2.0
Funding Commitments [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - Thereafter 0.4
Total Amounts Committed $ 0.4