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)	(15.6)			(24.7)			9.1
Net income (loss)	(15.7)
Other comprehensive income (loss)	58.4					59.6	(1.2)
Cash dividends on common stock ($0.54 per share)	(57.8)			(57.8)
Conversion of convertible notes	5.0			(0.5)	5.5
Employee stock plans	(5.1)		(24.0)	(10.7)	29.6
Total Stockholders' Equity at Sep. 30, 2014	2,979.6	11.0	1,161.9	2,396.4	(44.5)	(653.6)	108.4
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)	(142.6)			(151.0)			8.4
Other comprehensive income (loss)	2.2					6.0	(3.8)
Cash dividends on common stock ($0.54 per share)	(57.9)			(57.9)
Noncontrolling Interest, Dividends	16.0						16.0
Redeemable noncontrolling interest	0.0			(0.3)			0.3
Employee stock plans	10.5		(5.4)	(8.0)	23.9
Total Stockholders' Equity at Sep. 30, 2015	$ 2,505.5	$ 11.0	$ 1,158.8	$ 2,181.7	$ (20.4)	$ (925.4)	$ 99.8