STATEMENTS OF CHANGES IN CONSOLIDATED EQUITY (USD $) In Millions, unless otherwise specified	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)	(17.9)			(20.0)			2.1
Other comprehensive income (loss)	17.1					18.9	(1.8)
Cash dividends on common stock ($0.18 per share)	(19.3)			(19.3)
Employee stock plans	(7.5)		(25.7)	(10.1)	28.3
Total Stockholders' Equity at Mar. 31, 2014	2,967.1	11.0	1,160.2	2,440.7	(51.3)	(694.3)	100.8
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)	12.6			10.0			2.6
Other comprehensive income (loss)	0.4					0.6	(0.2)
Cash dividends on common stock ($0.18 per share)	(19.3)			(19.3)
Redeemable noncontrolling interest	0			(0.1)			0.1
Employee stock plans	5.0		(10.0)	(7.1)	22.1
Total Stockholders' Equity at Mar. 31, 2015	$ 2,708.0	$ 11.0	$ 1,154.2	$ 2,382.4	$ (22.2)	$ (930.8)	$ 113.4