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Basis of Presentation - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Cash and cash equivalents $ 247.0 $ 273.4
Restricted cash - current $ 49.1 $ 28.0
Restricted Cash, Current, Asset, Statement of Financial Position [Extensible List] us-gaap:PrepaidExpenseAndOtherAssetsCurrent us-gaap:PrepaidExpenseAndOtherAssetsCurrent
Restricted cash - noncurrent $ 0.1 $ 0.1
Restricted Cash, Noncurrent, Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent us-gaap:OtherAssetsNoncurrent
Total cash, cash equivalents and restricted cash $ 296.2 $ 301.5