STATEMENTS OF CHANGES IN CONSOLIDATED EQUITY - USD ($) $ in Millions	Total	[CommonStockMember]	[AdditionalPaidInCapitalMember]	[RetainedEarningsMember]	[TreasuryStockMember]	[AccumulatedOtherComprehensiveIncomeMember]	[NoncontrollingInterestMember]
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 (loss)	24.4					24.1	0.3
Cash dividends on common stock	(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
Total Stockholders' Equity at Dec. 31, 2015	2,184.4	11.0	1,161.7	1,945.9	(21.3)	(1,014.5)	101.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(113.6)			(120.0)			6.4
Other comprehensive income (loss)	37.8					40.8	(3.0)
Cash dividends on common stock	(17.2)			(17.2)
Purchase of subsidiary shares from noncontrolling interest	(0.1)						(0.1)
Employee stock plans	8.0		16.4	(2.0)	(6.4)
Total Stockholders' Equity at Jun. 30, 2016	$ 2,099.3	$ 11.0	$ 1,178.1	$ 1,806.7	$ (27.7)	$ (973.7)	$ 104.9