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Debt (6.00% Senior Notes) (Details) - Senior Notes - USD ($)
12 Months Ended
Sep. 25, 2014
Dec. 31, 2019
Dec. 31, 2018
Apr. 18, 2016
Mar. 19, 2013
Debt Instrument [Line Items]          
Stated interest rate   5.125%      
6.00% Senior Notes          
Debt Instrument [Line Items]          
Stated interest rate   6.00%      
Debt instrument, face amount       $ 350,000,000.0  
Percentage of principal amount redeemable   101.00%      
Violation or event of default, interest payment failure, term   30 days      
Violation or event of default, interest payment failure, maximum excess proceeds on sale of asset   $ 50,000,000.0      
Violation or event of default, interest payment failure, failure to comply with other indenture agreements, term   60 days      
6.00% Senior Notes | Minimum          
Debt Instrument [Line Items]          
Notice period prior to redemption   30 days      
6.00% Senior Notes | Maximum          
Debt Instrument [Line Items]          
Notice period prior to redemption   60 days      
6.00% Senior Notes | Redemption, Period On Or Prior To April 15, 2019          
Debt Instrument [Line Items]          
Percentage of principal amount redeemed   35.00%      
Redemption price percentage   106.00%      
6.00% Senior Notes | Redemption, Period Before April 15, 2021          
Debt Instrument [Line Items]          
Redemption price percentage   100.00%      
6.00% Senior Notes | Redemption, Period One          
Debt Instrument [Line Items]          
Redemption price percentage   103.00%      
6.00% Senior Notes | Redemption, Period Two          
Debt Instrument [Line Items]          
Redemption price percentage   102.00%      
6.00% Senior Notes | Redemption, Period Three          
Debt Instrument [Line Items]          
Redemption price percentage   101.00%      
6.00% Senior Notes | Redemption, Period Four          
Debt Instrument [Line Items]          
Redemption price percentage   100.00%      
5.875% Senior notes due 2024          
Debt Instrument [Line Items]          
Stated interest rate 5.875% 5.875% 5.875%    
Debt instrument, face amount $ 250,000,000.0        
Violation or event of default, interest payment failure, term 30 days        
Violation or event of default, interest payment failure, maximum excess proceeds on sale of asset $ 25,000,000.0        
Violation or event of default, interest payment failure, failure to comply with other indenture agreements, term 60 days        
5.875% Senior notes due 2024 | Redemption, Period Two          
Debt Instrument [Line Items]          
Redemption price percentage 100.00%        
5.125% Senior Notes          
Debt Instrument [Line Items]          
Stated interest rate   5.125% 5.125%    
Debt instrument, face amount         $ 300,000,000.0
Percentage of principal amount redeemable   101.00%      
5.125% Senior Notes | Minimum          
Debt Instrument [Line Items]          
Notice period prior to redemption   30 years      
5.125% Senior Notes | Maximum          
Debt Instrument [Line Items]          
Notice period prior to redemption   60 years