Statements of Changes in Consolidated Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance at Dec. 31, 2011	$ 2,571.6	$ 11.0	$ 1,207.1	$ 2,361.5	$ (162.7)	$ (941.6)	$ 96.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	167.8			158.4			9.4
Other comprehensive income (loss)	(85.9)					(87.8)	1.9
Cash dividends on common stock ($0.72 per share)	(76.5)			(76.5)
Purchase of subsidiary shares from noncontrolling interest	(0.1)						(0.1)
Employee Stock Plans	10.2		(25.4)	(15.8)	51.4
Ending balance at Dec. 31, 2012	2,587.1	11.0	1,181.7	2,427.6	(111.3)	(1,029.4)	107.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	161.6			154.0			7.6
Other comprehensive income (loss)	319.6					316.2	3.4
Cash dividends on common stock ($0.72 per share)	(76.9)			(76.9)
Dividends paid to noncontrolling interest	(18.0)						(18.0)
Employee Stock Plans	21.3		4.2	(14.6)	31.7
Ending balance at Dec. 31, 2013	2,994.7	11.0	1,185.9	2,490.1	(79.6)	(713.2)	100.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9.6			(2.6)			12.2
Other comprehensive income (loss)	(220.3)					(218.2)	(2.1)
Cash dividends on common stock ($0.72 per share)	(77.1)			(77.1)
Conversion of convertible notes	5.0			(0.5)	5.5
Redeemable noncontrolling interest	0			(0.3)			0.3
Employee Stock Plans	(2.6)		(21.7)	(10.7)	29.8
Ending balance at Dec. 31, 2014	$ 2,709.3	$ 11.0	$ 1,164.2	$ 2,398.9	$ (44.3)	$ (931.4)	$ 110.9