Subsequent Event (Details) - Subsequent Event [Member] $ / shares in Units, $ in Millions	Jan. 25, 2017 USD ($) $ / shares
Subsequent Event [Line Items]
Cash dividend, declared date	Jan. 25, 2017
Cash dividend, declared payable	Mar. 09, 2017
Cash dividend, declared record	Feb. 28, 2017
Cash dividend (in dollars per share) | $ / shares	$ 3.00
Cash dividend, subordinated debentures (in dollars per share) | $ / shares	$ 5.00
Subordinated debentures percentage	6.00%
Decrease in stockholders' equity	$ (460.0)
Increase in long term debt	287.0
Decrease in cash	$ (173.0)