Shareholders' Equity Share Repurchase Plan Information (Details) - USD ($) $ in Millions	2 Months Ended	7 Months Ended	10 Months Ended
	Feb. 18, 2015	Sep. 30, 2015	Dec. 31, 2014	Feb. 19, 2015	Feb. 07, 2014
Preferred Stock, Shares Outstanding		0	0
Stock Repurchased and Retired During Period, Value		$ 22.0	$ 36.7
Stock Repurchased and Retired During Period, Shares	335,251	655,178	910,990
Stock Repurchase Program, Authorized Amount				$ 50.0	$ 50.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 28.0	$ 13.3
Preferred Stock, No Par Value