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Reconciliation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Earnings Available to Common Shareholders	$ 10.3	$ 0.6	$ (0.1)	$ 10.8	$ 9.0	$ 0.5	$ (0.4)	$ 9.0	$ 21.6	$ 18.1	$ 16.3
Weighted Average Common Shares Outstanding-Basic									13,772,855	12,669,309	10,880,025
Plus: Diluted Effect of Incremental Shares (000's)									2,000	3,000	3,000
Weighted Average Common Shares Outstanding-Diluted									13,775,245	12,671,609	10,882,971
Earnings per Share-Basic and Diluted	$ 0.75	$ 0.04	$ (0.01)	$ 0.79	$ 0.66	$ 0.03	$ (0.03)	$ 0.83	$ 1.57	$ 1.43	$ 1.50

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- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or 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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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