Condensed Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Deficit)	Treasury Stock	Non-controlling Interests
Beginning Balance at Dec. 31, 2014	$ 2,263.1	$ 1.7	$ 2,517.3	$ (6.7)	$ 279.5	$ (532.3)	$ 3.6
Comprehensive income:
Net Income	119.7				119.7
Other comprehensive income (loss)	(17.8)			(17.8)
Stock options exercised	13.1		13.1
Stock-based compensation	(0.1)		13.6			(13.7)
Tax benefit on exercise of stock options	15.9		15.9
Treasury stock purchase	(0.4)					(0.4)
Dividends ($0.14 per common share) in 2015 and ($0.16 per common share) in 2016	(22.5)				(22.5)
Dividends paid to noncontrolling interests	(1.2)						(1.2)
Ending Balance at Jun. 30, 2015	2,369.8	1.7	2,559.9	(24.5)	376.7	(546.4)	2.4
Beginning Balance at Dec. 31, 2015	2,453.8	1.7	2,602.2	(52.5)	501.6	(602.1)	2.9
Comprehensive income:
Net Income	186.1				186.2		(0.1)
Other comprehensive income (loss)	13.2			13.2
Stock options exercised	14.6		14.6
Stock-based compensation	7.4		16.4			(9.0)
Treasury stock purchase	(362.7)					(362.7)
Dividends ($0.14 per common share) in 2015 and ($0.16 per common share) in 2016	(23.4)				(23.4)
Dividends paid to noncontrolling interests	(1.2)						(1.2)
Other	(5.2)		(5.2)
Ending Balance at Jun. 30, 2016	$ 2,282.6	$ 1.7	$ 2,628.0	$ (39.3)	$ 664.4	$ (973.8)	$ 1.6