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Effect of New Accounting Pronouncements - Summary of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
[1]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]        
Cash and cash equivalents $ 605.0 $ 681.2 [1] $ 564.9  
Restricted cash 1,655.5 1,623.8 [1] 1,615.6  
Total cash, cash equivalents and restricted cash $ 2,260.5 $ 2,305.0 $ 2,180.5 [1] $ 1,937.6
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.