Earnings per Common Share - Table 2 (Details) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	86.5	86.2	86.8	88.7
Convertible perpetual preferred stock	3.2	11.6	3.2	11.6
Convertible senior subordinated notes	8.2	0	8.1	0
Restricted stock awards, dilutive stock options, and restricted stock units	2.6	2.6	2.6	2.1
Diluted weighted average common shares outstanding	100.5	100.4	100.7	102.4