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Earnings Per Share - Schedule of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator
Net income (loss) (controlling interest)	$ 30.7	$ 107.7	$ 15.1	$ (93.1)
Interest expense on junior convertible securities, net of taxes	0.0	0.0	0.0	0.0
Net income (loss) (controlling interest), as adjusted	$ 30.7	$ 107.7	$ 15.1	$ (93.1)
Denominator
Average shares outstanding (basic) (in shares)	47.2	51.0	47.5	51.5
Effect of dilutive instruments:
Stock options and restricted stock units (in shares)	0.1	0.0	0.1	0.0
Average shares outstanding (diluted) (in shares)	47.3	51.0	47.6	51.5

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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