Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 35.1	$ 7.9
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	100,000,000	100,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000,000.0	1,000,000,000
Common stock, shares issued (in shares)	142,300,000	143,000,000
Common stock, shares outstanding (in shares)	142,300,000	143,000,000