Earnings (Loss) Per Share (Details 1) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Stock appreciation rights were outstanding, but not included in the diluted loss per share calculation
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.3	0.1	0.3	0.1
Minimum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount	$ 81.11	$ 51.40	$ 81.11	$ 51.40
Maximum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount	$ 81.14	$ 51.40	$ 81.14	$ 51.40