Stockholders' Equity, Other Comprehensive Income and Redeemable Noncontrolling Interest (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended						6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Common Stock [Member]	Dec. 31, 2011 Common Stock [Member]	Jun. 30, 2012 Capital in Excess of Par Value [Member]	Dec. 31, 2011 Capital in Excess of Par Value [Member]	Jun. 30, 2012 Accumulated Deficit [Member]	Jun. 30, 2012 Foreign Currency Translation [Member]	Jun. 30, 2012 Benefit Plan Liabilities [Member]	Jun. 30, 2012 Unrealized Gain (Loss) on Available-For-Sale Investments [Member]	Jun. 30, 2012 Noncontrolling Interest [Member]	Jun. 30, 2012 Redeemable Noncontrolling Interest [Member]
Summary of changes in stockholders' equity, other comprehensive income and redeemable noncontrolling interest
Balance at December 31, 2011			$ 31.3				$ 451.5	$ 451.5	$ (211.8)	$ (9.7)	$ (202.2)	$ (4.4)	$ 7.9
Balance at December 31, 2011, Shares			100		100	100
Net income	29.4	(7.8)	66.5	0.6					68.8				(2.1)	(0.2)
Foreign currency translation			(0.9)							(0.8)			(0.1)	(0.3)
Changes in unrecognized benefit costs (net of tax provision of $0.2)			1.3								1.3
Unrealized gain on available-for-sale investment			1.3									1.3
Fair value of noncontrolling interest associated with business acquired														2.4
Subscription receivable														(0.5)
Balance at June 30, 2012	$ 99.7		$ 99.7				$ 451.5	$ 451.5	$ (143.0)	$ (10.5)	$ (200.9)	$ (3.1)	$ 5.7	$ 1.4
Balance at June 30, 2012, Shares	100		100		100	100