Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Preferred stock, par value (USD per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	15,000,000	15,000,000.0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in USD per share)	$ 0.10	$ 0.10
Common stock, share authorized (in shares)	150,000,000.0	150,000,000.0
Common stock, shares issued (in shares)	80,100,000	76,800,000
Common stock, shares outstanding (in shares)	80,100,000	76,800,000
Treasury stock, shares (in shares)	2,100,000	2,100,000