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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net income (loss)	$ (10.5)	$ 30.2	$ (37.4)	$ 6.0
Net income (loss) per common share:
Basic (in USD per share)	$ (0.12)	$ 0.34	$ (0.41)	$ 0.07
Diluted (in USD per share)	$ (0.12)	$ 0.34	$ (0.41)	$ 0.07
Basic weighted average shares outstanding (in shares)	91.1	88.2	90.7	87.7
Diluted weighted average shares outstanding (in shares)	91.1	89.4	90.7	88.8
Stock options
Net income (loss) per common share:
Effect of potentially dilutive stock options (in shares)	0.0	0.2	0.0	0.3
Unvested restricted stock units
Net income (loss) per common share:
Effect of potentially dilutive stock options (in shares)	0.0	1.0	0.0	0.8

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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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