Earnings (Loss) Per Share - Computation of Weighted Average Shares Outstanding (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Earnings Per Share
Net income (loss) from continuing operations									$ 79.6	$ (77.0)	$ (191.8)
Net income attributable to the non-controlling interests									(0.7)	(1.5)	(2.3)
Net income (loss) from continuing operations attributable to common stockholders									$ 78.9	$ (78.5)	$ (194.1)
Basic weighted average common stock outstanding (in shares)									257.6	288.2	286.1
Denominator adjustments for diluted EPS:
Denominator adjustments for diluted EPS (in shares)									2.5	0.0	0.0
Dilutive weighted average common stock outstanding (in shares)									260.1	288.2	286.1
Earnings (loss) per share from continuing operations attributable to common stockholders:
Basic (in dollars per share)	$ 0.30	$ (0.02)	$ 0.06	$ (0.02)	$ (0.05)	$ (0.02)	$ (0.17)	$ (0.04)	$ 0.31	$ (0.27)	$ (0.68)
Diluted (in dollars per share)	$ 0.29	$ (0.02)	$ 0.06	$ (0.02)	$ (0.05)	$ (0.02)	$ (0.17)	$ (0.04)	$ 0.30	$ (0.27)	$ (0.68)
Series B Preferred Stock
Denominator adjustments for diluted EPS:
Number of shares issuable upon conversion of Series A Preferred Stock (in shares)									2.0	0.0	0.0
Number of stock options and RSU's (in shares)									0.5	0.0	0.0