Accounts Receivable - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jan. 01, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	$ 1,985.1		$ 2,891.9
Accounts receivable, allowance for credit losses	$ 56.1		35.5	$ 46.6
Percent accounts receivable outstanding, less than 60 days	96.00%
Account receivable sold under the RPAs	$ 288.3		$ 405.9
Fees and financing costs under the RPA	4.4	$ 5.8
Accounts receivable sold under RPAs	1,800.0	2,000.0
Cash proceeds from sale of accounts receivables	$ 1,700.0	$ 2,000.0
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sale price of receivables, percentage of sold amount	100.00%
London Interbank Offered Rate (LIBOR) | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable, basis spread on variable rate			3.00%
London Interbank Offered Rate (LIBOR) | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable, basis spread on variable rate			1.00%
Accounting Standards Update 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cumulative effect of change in accounting principle				(11.1)
Retained Earnings | Accounting Standards Update 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cumulative effect of change in accounting principle				$ (11.1)