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Organization and Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net income (loss)	$ 19.9	$ (26.9)
Net income (loss) per common share
Basic (USD per share)	$ 0.22	$ (0.30)
Diluted (USD per share)	$ 0.21	$ (0.30)
Basic weighted average shares outstanding (shares)	91.8	90.3
Diluted weighted average shares outstanding (shares)	94.1	90.3
Stock options and employee stock purchase plan
Net income (loss) per common share
Effect of potentially dilutive stock options (shares)	0.0	0.0
Restricted stock units
Net income (loss) per common share
Effect of potentially dilutive stock options (shares)	1.2	0.0
2023 Warrants
Net income (loss) per common share
Effect of potentially dilutive stock options (shares)	1.1	0.0
Senior convertible notes | Senior convertible notes due 2022
Net income (loss) per common share
Effect of potentially dilutive stock options (shares)	0.0	0.0
Senior convertible notes | Senior convertible notes due 2023
Net income (loss) per common share
Effect of potentially dilutive stock options (shares)	0.0	0.0

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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