STATEMENTS OF CHANGES IN CONSOLIDATED EQUITY - USD ($) $ in Millions	Total	[CommonStockMember]	[AdditionalPaidInCapitalMember]	[RetainedEarningsMember]	[TreasuryStockMember]	[AccumulatedOtherComprehensiveIncomeMember]	[NoncontrollingInterestMember]
Total Stockholders' Equity 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 (loss)	(18.6)			(24.0)			5.4
Other comprehensive income	46.0					49.0	(3.0)
Cash dividends on common stock ($0.36 per share)	(38.6)			(38.6)
Conversion of convertible notes	5.0			(0.5)	5.5
Employee stock plans	(9.9)		(29.3)	(10.5)	29.9
Total Stockholders' Equity at Jun. 30, 2014	2,978.6	11.0	1,156.6	2,416.5	(44.2)	(664.2)	102.9
Total Stockholders' Equity at Dec. 31, 2014	2,709.3	11.0	1,164.2	2,398.9	(44.3)	(931.4)	110.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1.3)			(6.4)			5.1
Other comprehensive income	24.4					24.1	0.3
Cash dividends on common stock ($0.36 per share)	(38.6)			(38.6)
Redeemable noncontrolling interest	0.0			(0.1)			0.1
Employee stock plans	6.9		(9.3)	(7.5)	23.7
Total Stockholders' Equity at Jun. 30, 2015	$ 2,700.7	$ 11.0	$ 1,154.9	$ 2,346.3	$ (20.6)	$ (907.3)	$ 116.4