Debt (Debt Transactions Narrative) (Details) - USD ($)		3 Months Ended		6 Months Ended
	Dec. 28, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Principal amount repurchased		$ 116,600,000		$ 116,600,000
Gain (loss) on debt extinguishment		0	$ 0	14,100,000	$ 0
Fair value of company debt		1,200,000,000		1,200,000,000		$ 1,200,000,000
Master Note and Security Agreement [Member]
Debt Instrument [Line Items]
Principal amount repurchased		60,100,000		60,100,000
Gain (loss) on debt extinguishment				(200,000)
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Principal amount repurchased		56,500,000		56,500,000
Gain (loss) on debt extinguishment				14,300,000
Debt instrument		$ 300,000,000		$ 300,000,000		300,000,000
Interest rate, percentage		7.00%		7.00%
International Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument		$ 19,700,000		$ 19,700,000		$ 19,700,000
International Term Loan [Member] | December 28, 2021 [Member]
Debt Instrument [Line Items]
Debt instrument term	6 years
International Term Loan [Member] | December 31, 2020 [Member]
Debt Instrument [Line Items]
Debt instrument		$ 18,500,000		$ 18,500,000
Debt instrument term				5 years
Fixed interest rate		1.72%		1.72%
International Term Loan [Member] | March 31, 2021 [Member]
Debt Instrument [Line Items]
Debt instrument		$ 1,200,000		$ 1,200,000
Debt instrument term				5 years
Fixed interest rate		1.71%		1.71%