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Commitments, Contingencies and Off-Balance Sheet Arrangements - Off-Balance Sheet Commitments (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2017
USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2017 $ 0.0
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 22.4
Total Amounts Committed 23.2
Letters of Credit [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2017 0.0
Amount of Commitment Expiration by Period - Thereafter 20.7
Total Amounts Committed 20.7
Financial Guarantees [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2017 0.0
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 1.3
Total Amounts Committed 2.1
Funding Commitments [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2017 0.0
Amount of Commitment Expiration by Period - Thereafter 0.4
Total Amounts Committed $ 0.4