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Accounts Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Accounts receivable
Accounts receivable, net of allowance				$ 2,705.6	$ 2,344.0
Beneficial interest retained, percentage of accounts receivable				10.00%
Account receivable sold	$ 377.3	$ 235.5
Retained beneficial interest	15.9	11.4
Fees and interest paid under RPA	12.4	4.8	$ 2.8
Accounts receivable sold under repurchase agreement	6,100.0	3,000.0
Amount collected of accounts receivables under repurchase agreement	5,900.0	2,900.0
Minimum
Accounts receivable
Sale price of receivables, percentage of sold amount				90.00%
Minimum | LIBOR
Accounts receivable
Receivable, basis spread on variable rate				1.00%
Maximum
Accounts receivable
Sale price of receivables, percentage of sold amount				100.00%
Maximum | LIBOR
Accounts receivable
Receivable, basis spread on variable rate				3.00%
Allowance for bad debt
Accounts receivable
Allowance for bad debt	27.8	25.0	25.0	$ 27.8	$ 24.9
Activities in allowance for bad debt
Balance as of beginning of period	24.9	25.0	25.7
Charges to provision for bad debt	9.3	15.4	7.5
Write-off of uncollectible accounts receivable	(8.7)	(15.9)	(8.3)
Recoveries of bad debt	2.0	0.3	0.5
Translation Adjustments	0.3	0.2	(0.4)
Balance as of end of period	$ 27.8	$ 24.9	$ 25.0

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Amount of beneficial interest received as consideration for transferring noncash financial asset. Includes, but is not limited to, trade receivable in securitization transaction.

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Amount of deductions to trade receivables held-for-sale, after allowance for bad debt, that are not part of a disposal group.

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Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from adjustments.

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