Financing Arrangements - Short Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Short-term Debt [Line Items]
Short-term debt	$ 167.5	$ 119.8
Line of Credit Accounts Receivable
Short-term Debt [Line Items]
Line of credit facility, interest rate at period end		0.96%	0.96%
Short-term debt	100.0	$ 58.0
Current borrowing capacity	100.0
Foreign Subsidiary
Short-term Debt [Line Items]
Short-term debt	$ 67.5	$ 61.8
Line of credit stated variable interest rate, low range	0.50%	0.24%
Line of credit stated variable interest rate, high range	1.75%	1.75%