Equity (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period			$ (1.5)
Current-period change	(9.8)	(9.2)	(19.7)	(1.6)
Balance at the end of the period	(21.2)		(21.2)
Deferred tax assets in accumulated other comprehensive income, unrealized loss on investments	0.1		0.1		0.1
Deferred tax assets in accumulated other comprehensive income, pension liabilities	13.4		13.4		13.4
Foreign Currency Translation Gain
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period			21.0
Current-period change			(19.9)
Balance at the end of the period	1.1		1.1
Unrealized Loss on Investments, Net of Tax
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period			(0.2)
Current-period change			0.2
Minimum Pension Liability, Net of Tax
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period					(22.3)
Balance at the end of the period	$ (22.3)		$ (22.3)		$ (22.3)