Long-Term Debt (Schedule Of Revolving Credit Facility) (Details) (USD $)	0 Months Ended	3 Months Ended		12 Months Ended
	Sep. 06, 2013	Apr. 03, 2015		Dec. 31, 2014		Dec. 31, 2013	Jul. 22, 2011
Debt Instrument [Line Items]
Outstanding borrowings		$ 1,213,300,000		$ 1,337,400,000
Outstanding letters of credit		55,100,000
Equity interest pledged in all domestic subsidiaries, percentage	100.00%
Non-voting equity interest pledged in certain foreign subsidiaries, percentage	100.00%
Europe [Member]
Debt Instrument [Line Items]
Outstanding borrowings		9,600,000		10,500,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	1,000,000,000.0			700,000,000			400,000,000
Capital expenditures to fixed charges ratio	100.00%
Increase, additional borrowings	250,000,000
Capitalized deferred finance costs		900,000		1,700,000		4,900,000
Threshold for line of credit facility percentage of asset based revolving credit facilities	10.00%
Outstanding borrowings		202,400,000		136,800,000
Total credit under facility		1,000,000,000		1,000,000,000
Undrawn availability		391,300,000	[1]	425,000,000	[1]
Interest rate		2.60%		2.10%
Outstanding letters of credit		41,400,000		58,500,000
Original issuance		Jul. 31, 2011		Jul. 31, 2011
Maturity date		Sep. 30, 2018		Sep. 30, 2018
Equity interest pledged	65.00%
Revolving Credit Facility [Member] | UNITED STATES [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity							630,000,000
Undrawn availability		237,500,000		257,700,000
Revolving Credit Facility [Member] | CANADA [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity							70,000,000
Undrawn availability		52,300,000		54,300,000
Revolving Credit Facility [Member] | Europe [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity							300,000,000
Undrawn availability		101,500,000		113,000,000
Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Threshold for line of credit facility borrowings	$ 100,000,000
Line of Credit Facility, Commitment Fee Percentage	0.25%
Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.375%

[1] Total undrawn availability for the U.S. borrower, the Canadian borrower and the European borrowers at April 3, 2015 is $237.5 million, $52.3 million and $101.5 million, respectively. Total undrawn availability for the U.S. borrower, the Canadian borrower and the European borrowers at December 31, 2014 was $257.7 million, $54.3 million and $113.0 million, respectively.