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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	As Adjusted [Member]	Common Stock [Member]	Common Stock [Member] As Adjusted [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] As Adjusted [Member]	Treasury Stock [Member]	Treasury Stock [Member] As Adjusted [Member]	Retained Earnings [Member]	Retained Earnings [Member] As Adjusted [Member]	Accumulated Other Comprehensive Income [Member]
Balance, value at Jun. 30, 2018	$ 729.3		$ 0.1		$ 1,195.2		$ (1,073.9)		$ 606.4		$ 1.5
Balance, shares at Jun. 30, 2018			62,889,679
Net income	3.8								3.8
Other comprehensive income	(1.5)										(1.5)
Issuance of common stock for share- based award compensation plans	2.1				2.1
Issuance of common stock for share-based award compensation plans, shares			140,379
Payroll taxes for deferred stock units	(0.9)				(0.9)
Purchases of treasury stock	(39.4)						(39.4)
Share-based compensation	16.7				16.7
Balance, value at Sep. 30, 2018	710.1		$ 0.1		1,213.1		(1,113.3)		610.2
Balance, shares at Sep. 30, 2018			63,030,058
Balance, value at Jun. 30, 2018	729.3		$ 0.1		1,195.2		(1,073.9)		606.4		$ 1.5
Balance, shares at Jun. 30, 2018			62,889,679
Net income	16.6
Balance, value at Dec. 31, 2018	704.2		$ 0.1		1,232.3		(1,151.2)		623.0
Balance, shares at Dec. 31, 2018			63,803,544
Balance, value at Sep. 30, 2018	710.1		$ 0.1		1,213.1		(1,113.3)		610.2
Balance, shares at Sep. 30, 2018			63,030,058
Net income	12.8								12.8
Issuance of common stock for share- based award compensation plans	9.3				9.3
Issuance of common stock for share-based award compensation plans, shares			773,486
Payroll taxes for deferred stock units	(6.3)				(6.3)
Purchases of treasury stock	(37.9)						(37.9)
Share-based compensation	16.2				16.2
Balance, value at Dec. 31, 2018	704.2		$ 0.1		1,232.3		(1,151.2)		623.0
Balance, shares at Dec. 31, 2018			63,803,544
Balance, value at Jun. 30, 2019	657.3	$ 656.4	$ 0.1	$ 0.1	1,266.1	$ 1,266.1	(1,192.4)	$ (1,192.4)	583.5	$ 582.6
Balance, shares at Jun. 30, 2019			64,283,948	64,283,948
Cumulative effect of changes in accounting principles at Jun. 30, 2019	(0.9)								(0.9)
Net income	4.0								4.0
Issuance of common stock for share- based award compensation plans	1.7				1.7
Issuance of common stock for share-based award compensation plans, shares			209,110
Payroll taxes for deferred stock units	(1.5)				(1.5)
Purchases of treasury stock	(17.0)						(17.0)
Share-based compensation	11.2				11.2
Balance, value at Sep. 30, 2019	654.8		$ 0.1		1,277.5		(1,209.4)		586.6
Balance, shares at Sep. 30, 2019			64,493,058
Balance, value at Jun. 30, 2019	657.3	$ 656.4	$ 0.1	$ 0.1	1,266.1	$ 1,266.1	(1,192.4)	$ (1,192.4)	583.5	$ 582.6
Balance, shares at Jun. 30, 2019			64,283,948	64,283,948
Cumulative effect of changes in accounting principles at Jun. 30, 2019	(0.9)								(0.9)
Net income	23.8
Balance, value at Dec. 31, 2019	691.3		$ 0.1		1,294.2		(1,209.4)		606.4
Balance, shares at Dec. 31, 2019			65,388,813
Balance, value at Sep. 30, 2019	654.8		$ 0.1		1,277.5		(1,209.4)		586.6
Balance, shares at Sep. 30, 2019			64,493,058
Net income	19.8								19.8
Issuance of common stock for share- based award compensation plans	11.8				11.8
Issuance of common stock for share-based award compensation plans, shares			895,755
Payroll taxes for deferred stock units	(7.2)				(7.2)
Share-based compensation	12.1				12.1
Balance, value at Dec. 31, 2019	$ 691.3		$ 0.1		$ 1,294.2		$ (1,209.4)		$ 606.4
Balance, shares at Dec. 31, 2019			65,388,813

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