Shareowners' Deficit (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) shares
Class of Stock [Line Items]
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.01	$ 0.01
Common Stock, Shares, Outstanding	42,197,965	42,056,237
Stock Repurchase Program, Authorized Amount | $	$ 150.0
Repurchase and retirement of shares	0	200,000	0
Stock Repurchased and Retired During Period, Value | $		$ 4.8
Stock repurchased and retired during period, average price per share | $ / shares		$ 19.67
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $	$ 124.4
Treasury Stock, Value | $			$ 0.5
Preferred Stock, Shares Authorized	2,357,299	2,357,299
Preferred Stock, Shares Issued	155,250	155,250
Preferred Stock, Depositary Shares	3,105,000	3,105,000
Preferred Stock Converstion Rate	5.7676
Preferred Stock, Dividends, Per Share, Cash Paid | $ / shares	$ 67.50
Preferred stock dividends per depositary share | $ / shares	3.3752
Preferred Stock, Liquidation Preference Per Share | $ / shares	1,000	$ 1,000
Preferred Stock Liquidation Preference Per Depositary Share | $ / shares	$ 50	$ 50
Preferred Stock Dividends and Other Adjustments | $	$ 10.4	$ 10.4	$ 10.4
Preferred Voting Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	1,357,299
Nonvoting Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	1,000,000