Debt (Revolving Credit Agreement) (Narrative) (Details) - USD ($) $ in Millions			9 Months Ended
	Oct. 28, 2015	Jun. 19, 2015	Sep. 30, 2015	Dec. 31, 2014	Dec. 19, 2014
Line of Credit | Subsequent Event
Line of Credit Facility [Line Items]
Default provision, term	60 days
Line of Credit | Revolving Facility
Line of Credit Facility [Line Items]
Revolving Credit, maximum borrowing capacity		$ 1,650.0			$ 1,500.0
Increase in capacity		$ 150.0
Revolving Credit, fair value of amount outstanding			$ 0.0	$ 0.0
Line of Credit | Revolving Facility | Trailing Four Quarters | Maximum
Line of Credit Facility [Line Items]
Leverage ratio			4.75 to 1.00
Line of Credit | Revolving Facility | Subsequent Two Fiscal Quarters | Maximum
Line of Credit Facility [Line Items]
Leverage ratio			4.25 to 1.00
Line of Credit | Revolving Facility | Any Fiscal Quarter Thereafter | Maximum
Line of Credit Facility [Line Items]
Leverage ratio			3.75 to 1.00