Earnings Per Common Share (Details) - USD ($) $ in Millions	3 Months Ended							6 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2015	Sep. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Exclusion of Interest and Deferred Financing Fees from Diluted Income	$ 0.6	$ 0.9	$ 1.1					$ 2.0			$ 2.6		$ 3.2
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	973,000	874	575,000	50,000	1,110	1,373	1,496,000	724	336	1,289	809,000	1,335	900,000	700,000	1,000,000
Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount														13,500,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount of Additional Income														$ 5.8