Equity (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	$ (48.9)
Current-period change	(24.8)
Balance at the end of the period	(73.7)
Deferred tax assets in accumulated other comprehensive income, unrealized gain on investments	0.1	0.1
Deferred tax assets in accumulated other comprehensive income, pension liabilities	15.6	15.6
Foreign Currency Transaction Loss
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	(23.2)
Current-period change	(24.9)
Balance at the end of the period	(48.1)
Unrealized Gain on Investments, Net of Tax
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	0.4
Current-period change	0.1
Balance at the end of the period	0.5
Pension and Postretirement Benefit Adjustments, Net of Tax
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period		(26.1)
Balance at the end of the period	$ (26.1)	$ (26.1)