Debt (Receivables, Securitization Facility and Commercial Paper) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Short-term borrowings	$ 0.4	$ 1.9
Receivables Facility
Short-term Debt [Line Items]
Accounts receivable securitization facility maximum borrowing capacity	400.0
Note Securitization Facility [Member]
Short-term Debt [Line Items]
Accounts receivable securitization facility maximum borrowing capacity	$ 200.0
London Interbank Offered Rate (LIBOR) [Member] | Receivables Facility
Short-term Debt [Line Items]
Basis spread on variable rate	0.78%
London Interbank Offered Rate (LIBOR) [Member] | Note Securitization Facility [Member]
Short-term Debt [Line Items]
Basis spread on variable rate	0.75%
Commercial Paper [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,650.0
Debt Instrument, Redemption, Description	P364D