Transfers of Financial Assets - Additional Information (Detail) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Transfer of Financial Assets Accounted for as Sales [Line Items]
Aggregate face value of receivables sold	$ 1,942,800,000	$ 1,050,500,000
Cash proceeds from receivables	1,942,100,000	1,049,800,000
Proceeds from customers	1,613,100,000	682,200,000
Repurchase of accounts receivables sold	166,700,000	$ 58,900,000
Proceeds from other current liabilities	48,900,000		$ 103,500,000
Incremental operating cash inflows	25,000,000
Revolving Credit Facility [Member]
Transfer of Financial Assets Accounted for as Sales [Line Items]
Current maximum funding limit	400,000,000
U.S and Japan Revolving Arrangements [Member]
Transfer of Financial Assets Accounted for as Sales [Line Items]
Maximum exposures to loss associated	31,000,000		22,900,000
Derecognized net receivables outstanding amount	$ 341,800,000		$ 261,200,000