Income Taxes (Reconciliation) (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2016	Dec. 31, 2014	Dec. 31, 2013
Income Taxes
Statutory U.S. federal income tax rate		35.00%
Statutory federal income tax expense	$ 4,000,000	$ (214,900,000)	$ 85,300,000	$ 83,700,000
U.S. state income taxes	300,000	(17,800,000)	6,000,000	5,900,000
Foreign tax rate differential	800,000	2,800,000	(3,700,000)	(4,700,000)
Non-deductible charges/losses and other	(800,000)	1,600,000	800,000	4,200,000
Exit taxes			67,300,000
Total income tax (benefit) expense	4,300,000	(228,300,000)	155,700,000	89,100,000
Changes in valuation allowance	$ 0	$ 7,100,000	$ 12,000,000	$ 1,400,000