Earnings per Common Share - Table 3 (Details) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	86.7	86.1	87.0	90.0
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	2.5	2.1	2.5	1.8
Diluted weighted average common shares outstanding	100.6	99.8	100.8	103.4