Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended								12 Months Ended
	Jan. 31, 2016	Dec. 31, 2015	Oct. 02, 2014	Jul. 03, 2014	Apr. 03, 2014	Dec. 31, 2013	Sep. 26, 2013	Jun. 27, 2013	Mar. 28, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basic EPS
(Loss) income available to common shareholders										$ 788.0	$ 357.2	$ (621.4)
(Loss) income available to common shareholders (in shares)										138.4	140.0	141.3
(Loss) earnings per share, basic (in dollars per share)		$ 1.02	$ 2.25	$ 1.11	$ 1.31	$ (0.77)	$ 1.21	$ 1.01	$ 1.08	$ 5.69	$ 2.55	$ (4.40)
Income allocated to participating securities										$ 0.7	$ 1.6	$ 0.0
Income allocated to participating securities, shares										0.1	0.6	0.0
Net income (loss)		$ 138.3	$ 313.6	$ 154.9	$ 181.9	$ (106.2)	$ 168.0	$ 143.4	$ 153.6	$ 788.7	$ 358.8	$ (621.4)
Diluted potential common shares (in shares)										0.9	1.0	0.0
Diluted EPS
Net (loss) income		$ 138.3	$ 313.6	$ 154.9	$ 181.9	$ (106.2)	$ 168.0	$ 143.4	$ 153.6	$ 788.7	$ 358.8	$ (621.4)
Shares										139.4	141.6	141.3
(Loss) earnings per share, diluted (in dollars per share)		$ 1.01	$ 2.24	$ 1.11	$ 1.30	$ (0.77)	$ 1.20	$ 1.01	$ 1.07	$ 5.66	$ 2.53	$ (4.40)
Common Stock, Shares, Outstanding		135.6				144.8				135.6	141.1	144.8
Issued But Unvested Shares (in shares)		1.9				3.4				1.9	2.3	3.4
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax										$ 3.7	$ 0.0	$ 11.7
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 50.0								50.0
Accumulated Other Comprehensive Income (Loss)		(160.5)								$ (160.5)	$ (153.8)
Treasury Stock, Shares, Acquired	1.0									5.7	4.0
Stock Repurchased During Period, Value										$ (300.0)	$ 129.2
Noncontrolling interest		0.5								0.5	0.5
Accumulated Defined Benefit Plans Adjustment [Member]
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss)		(121.5)								(121.5)	(130.0)
Accumulated SERP And Retiree Medical [Member]
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss)		6.1								6.1	2.1
Foreign Currency Impact On Long Term Intercompany Loan [Member]
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss)		(9.2)								(9.2)	(5.7)
Accumulated Translation Adjustment [Member]
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss)		(35.5)								(35.5)	(19.1)
Accumulated Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss)		$ (0.4)								$ (0.4)	$ (1.1)