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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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net income (loss)	$ 45.8	$ 46.6	$ 8.4	$ 52.6
Net income per common share:
Basic (in USD per share)	$ 0.50	$ 0.53	$ 0.09	$ 0.60
Diluted (in USD per share)	$ 0.50	$ 0.52	$ 0.09	$ 0.59
Basic weighted average shares outstanding (in shares)	91.3	88.5	90.9	88.0
Diluted weighted average shares outstanding (in shares)	92.5	90.3	92.2	89.3
Options outstanding to purchase common stock
Net income per common share:
Effect of potentially dilutive stock options (in shares)	0.0	0.2	0.0	0.2
Unvested restricted stock units
Net income per common share:
Effect of potentially dilutive stock options (in shares)	1.2	1.6	1.3	1.1

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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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