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Debt (Details)
1 Months Ended 12 Months Ended
Dec. 29, 2015
USD ($)
Jan. 31, 2017
USD ($)
$ / shares
Jul. 31, 2015
USD ($)
Apr. 30, 2013
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Feb. 28, 2018
Debt                
Additional aggregate principal amount         $ 411,200,000 $ 600,000,000    
Reduction in long-term debt         381,814,000 493,612,000 $ 27,478,000  
Deferred finance costs         27,997,000 26,049,000    
Payment of debt principal         $ 162,500,000 162,500,000 300,000,000  
Guarantor Subsidiaries                
Debt                
Redemption price of debt instrument (as a percent)         100.00%      
Redemption price of principal amount of debt instrument including accrued and unpaid interest (as a percent)         101.00%      
2.35% senior notes due September 2016                
Debt                
Interest rate on senior notes due (as a percent)         2.35%      
5.10% senior notes due September 2023                
Debt                
Interest rate on senior notes due (as a percent)         5.10%      
9.25% senior notes due January 2019                
Debt                
Interest rate on senior notes due (as a percent)         9.25%      
6.15% senior notes due February 2018                
Debt                
Interest rate on senior notes due (as a percent)         6.15%      
6.15% senior notes due February 2018 | Subsequent Event                
Debt                
Interest rate on senior notes due (as a percent)               6.15%
5.00% senior notes due September 2020                
Debt                
Interest rate on senior notes due (as a percent)         5.00%      
4.625% senior notes due September 2021                
Debt                
Interest rate on senior notes due (as a percent)         4.625%      
5.50% senior notes due January 2023                
Debt                
Interest rate on senior notes due (as a percent)         5.50%      
0.75% senior exchangeable notes due January 2024                
Debt                
Aggregate amount of senior notes   $ 575,000,000     $ 575,000,000      
Interest rate on senior notes due (as a percent)   0.75%     0.75%      
Debt exchangeable notes   $ 411,200,000            
Equity component   163,800,000            
Deferred finance costs   9,600,000            
Equity issuance costs   $ 3,900,000            
Exchange rate of common shares   39.75            
Principal amount of notes   $ 1,000            
Exchange price per common share (in dollars per share) | $ / shares   $ 25.16            
Premium over share price (as a percent)         75.00%      
Share price of shares purchased (in dollars per share) | $ / shares   $ 17.97            
Mandatory debt prepayment   $ 162,500,000            
0.75% senior exchangeable notes due January 2024 | Minimum                
Debt                
Exchange price per common share (in dollars per share) | $ / shares         $ 31.45      
Revolving Credit Facility                
Debt                
Revolving credit facility         $ 510,000,000      
Maximum borrowing capacity     $ 2,200,000,000          
Increase in maximum borrowing capacity     $ 500,000,000          
Exercise of accordion option           50,000,000    
Weighted average interest rate (as a percent)         2.73%      
Remaining availability under credit facility         $ 2,250,000,000      
Revolving Credit Facility | Maximum                
Debt                
Debt to capital ratio         0.60      
Revolving Credit Facility | Minimum                
Debt                
Remaining period to maturity         1 year      
Five-year term loan facility                
Debt                
Maximum borrowing capacity $ 325,000,000              
Unsecured debt maturity period 5 years              
Mandatory debt prepayment $ 162,500,000              
Commercial paper                
Debt                
Revolving credit facility         $ 40,000,000      
Weighted average interest rate (as a percent)         1.87%      
Commercial paper | Guarantor Subsidiaries                
Debt                
Maximum borrowing capacity       $ 2,250,000,000        
Commercial paper | Guarantor Subsidiaries | Maximum                
Debt                
Debt instrument, maturity term       397 days        
Senior Notes.                
Debt                
Principal amount redeemed         $ 367,900,000 152,700,000 27,500,000  
Reduction in long-term debt         $ 381,700,000 $ 157,500,000 $ 27,500,000