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Financial Guarantees and Residual Value Guarantees - Activity on Financial Guarantees and Residual Guarantees (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure activity on financial guarantees and residual guarantees [line items]      
Beginning balance $ 156.8 $ 210.8 $ 293.1
Additions   4.9 12.0
Interest Additions 1.5 2.0 1.7
Disposals (17.2) (40.8) (102.2)
Reversals     (10.4)
Market value 16.5 (13.3) 27.5
Guarantee amortization (5.5) (6.8) (10.9)
Ending balance 152.1 156.8 210.8
Financial guarantee [member]      
Disclosure activity on financial guarantees and residual guarantees [line items]      
Beginning balance 17.1 22.7 40.1
Additions   1.2 0.1
Disposals     (6.6)
Guarantee amortization (5.5) (6.8) (10.9)
Ending balance 11.6 17.1 22.7
Financial guarantee of residual value [member]      
Disclosure activity on financial guarantees and residual guarantees [line items]      
Beginning balance 108.9 122.2 94.7
Market value 16.5 (13.3) 27.5
Ending balance 125.4 108.9 122.2
Accounts payable [member]      
Disclosure activity on financial guarantees and residual guarantees [line items]      
Beginning balance 30.8 65.9 57.4
Additions   3.7 11.9
Interest Additions 1.5 2.0 1.7
Disposals (17.2) (40.8) (95.6)
Reclassifications     90.5
Ending balance $ 15.1 $ 30.8 65.9
Additional provision [member]      
Disclosure activity on financial guarantees and residual guarantees [line items]      
Beginning balance     100.9
Reversals     (10.4)
Reclassifications     $ (90.5)