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Earnings Per Share (Reconciliation of Basic and Diluted Earnings Per Share Computations) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income (loss) per share - basic
Net income (loss) attributable to common stockholders	$ 45.0	$ 67.9	$ 136.1	$ 120.4
Weighted average common shares outstanding (in shares)	32,213	35,423	32,815	36,253
Earnings per common share (in dollars per share)	$ 1.40	$ 1.92	$ 4.15	$ 3.32
Net income (loss) per share - diluted
Net income (loss) attributable to common stockholders	$ 45.0	$ 67.9	$ 136.1	$ 120.4
Weighted average common shares outstanding (in shares)	32,213	35,423	32,815	36,253
Common equivalent shares:
Dilutive share-based awards (in shares)	323	322	327	326
Weighted average common shares outstanding - assuming dilution (in shares)	32,536	35,745	33,142	36,579
Earnings per common share assuming dilution (in dollars per share)	$ 1.38	$ 1.90	$ 4.11	$ 3.29

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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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