Income Taxes (Components of Earnings Before Income Taxes) (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2016	Dec. 31, 2014	Dec. 31, 2013
Tax Indemnity Payable To Former Parent		$ 6,500,000
(Loss) earnings before income taxes
United States	$ 11,300,000	(624,400,000)	$ 210,900,000	$ 197,500,000
Foreign	100,000	10,300,000	32,900,000	42,000,000
(Loss) earnings before income taxes	$ 11,400,000	(614,100,000)	$ 243,800,000	$ 239,500,000
Other Current Liabilities [Member]
Tax Indemnity Payable To Former Parent		1,900,000
Other Long term Liabilities [Member]
Tax Indemnity Payable To Former Parent		$ 4,600,000