Unaudited Condensed Consolidated Statements Of Shareholders' Equity - USD ($) $ in Millions	Total	Common shares	Treasury shares	Accumulated Other Comprehensive Loss	Retained earnings
Balance, at beginning of period at Dec. 31, 2014	$ 3,778.3	$ 408.0	$ (143.1)	$ 0.0	$ 3,513.4
Net income	82.2				82.2
Dividends	(68.8)				(68.8)
Stock compensation	13.3		18.4		(5.1)
Share repurchases	(245.3)		(245.3)
Shares cancelled	0.0	(21.3)	213.7		(192.4)
Foreign currency translation adjustment	(4.3)			(4.3)
Balance, at end of period at Sep. 30, 2015	3,555.4	386.7	(156.3)	(4.3)	3,329.3
Balance, at beginning of period at Dec. 31, 2015	3,532.5	386.7	(155.1)	(9.3)	3,310.2
Net income	296.1				296.1
Dividends	(68.8)				(68.8)
Stock compensation	18.4		17.6		0.8
Share repurchases	(166.2)		(166.2)
Shares cancelled	0.0	(7.9)	66.7		(58.8)
Foreign currency translation adjustment	3.9			3.9
Balance, at end of period at Sep. 30, 2016	$ 3,615.9	$ 378.8	$ (237.0)	$ (5.4)	$ 3,479.5