Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance	$ 8.3	$ 8.2
Preferred stock, shares authorized	2,500,000	2,500,000
Preferred stock, par value (usd per share)	$ 0.001	$ 0.001
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares authorized	300,000,000.0	300,000,000.0
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares issued	116,000,000.0	114,500,000
Common stock, shares outstanding	116,000,000.0	114,500,000