Debt - Maturing within One Year (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Short-term foreign debt	$ 144.9	$ 106.5
Commercial paper	0.0	55.2
Total short-term debt	144.9	161.7
Current portion of long-term debt	82.8	386.0
Short-term debt and current portion of long-term debt	$ 227.7	$ 547.7
Short-term Foreign Debt
Short-term Debt [Line Items]
Weighted average interest rates for short-term debt outstanding at year-end	16.30%