Combined Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 22.8	$ 17.9
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000.0	100.0
Common stock, shares issued (in shares)	158,700,000.0	100
Common stock, shares outstanding (in shares)	158,700,000.0	100
Preferred stock, without par value (in USD per share)	$ 0	$ 0
Preferred shares authorized (in shares)	15,000,000.0	0
Preferred shares Issued (in shares)	0	0
Preferred shares outstanding (in shares)	0	0