Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		7 Months Ended	9 Months Ended
	Aug. 11, 2015	Sep. 30, 2015	Sep. 30, 2014	Aug. 14, 2015	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost				$ 12.7
Stock-based compensation expense		$ 12.7	$ 1.3		$ 15.3	$ 4.0
Selling And Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 12.0	$ 1.2		$ 14.6	$ 3.3
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	100.00%