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Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator
Net income (loss) (controlling interest)	$ 107.7	$ 117.0	$ (93.1)	$ 270.0
Interest expense on junior convertible securities, net of taxes	0.0	0.0	0.0	9.5
Net income (loss) (controlling interest), as adjusted	$ 107.7	$ 117.0	$ (93.1)	$ 279.5
Denominator
Average shares outstanding (basic) (in shares)	51.0	54.0	51.5	54.3
Effect of dilutive instruments:
Stock options and restricted stock units (in shares)	0.0	0.2	0.0	0.3
Junior convertible securities (in shares)	0.0	0.0	0.0	2.2
Average shares outstanding (diluted) (in shares)	51.0	54.2	51.5	56.8

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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