Debt (Receivables, Securitization Facility and Commercial Paper) (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Short-term borrowings	$ 36,900,000	$ 1,100,900,000
Commercial Paper [Member]
Short-term Debt [Line Items]
Short-term borrowings	30,000,000.0	651,300,000
Receivables Facility
Short-term Debt [Line Items]
Short-term borrowings	0	248,400,000
Note Securitization Facility
Short-term Debt [Line Items]
Short-term borrowings	0	200,000,000.0
Other Current Portion of Long-term Debt
Short-term Debt [Line Items]
Short-term borrowings	$ 6,900,000	$ 1,200,000