Segment Reporting (Revenues by Geographic Area Based on Destination) (Details) - USD ($)	1 Months Ended	3 Months Ended								12 Months Ended
	Jan. 31, 2015	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Jan. 31, 2016	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues	$ 133,000,000	$ 358.20	$ 365.00	$ 412.70	$ 431.50	$ 440,700,000	$ 453,200,000	$ 430,900,000	$ 370,900,000	$ 1,567,400,000	$ 1,695,700,000	$ 1,291,600,000
% of Revenues	100.00%									100.00%	100.00%	100.00%
U.S.
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues	$ 90,100,000									$ 955,300,000	$ 1,111,500,000	$ 749,100,000
% of Revenues	67.70%									61.00%	65.50%	58.00%
Europe
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues	$ 28,300,000									$ 376,300,000	$ 374,200,000	$ 350,600,000
% of Revenues	21.30%									24.00%	22.10%	27.10%
Asia, Pacific Rim, Middle East and other
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues	$ 14,600,000									$ 235,800,000	$ 210,000,000	$ 191,900,000
% of Revenues	11.00%									15.00%	12.40%	14.90%