Equity (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	$ (6.7)
Current-period change	(42.2)
Balance at the end of the period	(48.9)
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	6.9
Foreign Currency Transaction (Losses) Gains
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	3.2
Current-period change	(26.4)
Balance at the end of the period	(23.2)
Unrealized Gain 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
Balance at the end of the period	0.4
Pension and Postretirement Benefit Adjustments
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	(10.1)
Current-period change	(16.0)
Balance at the end of the period	$ (26.1)