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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, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net income	$ 40.3	$ 19.9
Net income per common share
Basic (USD per share)	$ 0.42	$ 0.22
Diluted (USD per share)	$ 0.41	$ 0.21
Basic weighted average shares outstanding (shares)	96.3	91.8
Diluted weighted average shares outstanding (shares)	99.4	94.1
Restricted stock units
Net income per common share
Effect of potentially dilutive stock options (shares)	0.7	1.2
Warrants
Net income per common share
Effect of potentially dilutive stock options (shares)	2.4	1.1
Senior convertible notes
Net income 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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