Earnings Per Share, Calculation of EPS (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net income	$ (292.2)us-gaap_NetIncomeLoss	$ 15.8us-gaap_NetIncomeLoss
Denominator — Weighted-average common shares outstanding (in thousands):
Basic	17,344	17,921
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares	0	122
Add: dilutive effect of warrants	0	471
Diluted	17,344	18,514
Net (loss) income per common share:
Basic	$ (16.85)us-gaap_EarningsPerShareBasic	$ 0.88us-gaap_EarningsPerShareBasic
Earnings per common share, Diluted:
Diluted	$ (16.85)us-gaap_EarningsPerShareDiluted	$ 0.85us-gaap_EarningsPerShareDiluted

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Nonvested equity-based payment awards that contain forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) that result in incremental common shares.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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