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Debt and Credit Facility - Debt Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2018
May 31, 2018
Mar. 31, 2018
Feb. 28, 2017
Feb. 28, 2015
Debt Instrument [Line Items]          
Long-term debt, gross $ 11,936.8   $ 4,481.3    
Total Convertible Debt 4,481.3   4,481.3    
Less: Debt discount (1,298.0) $ (10.5) (1,372.9)    
Less: Debt issuance costs (96.5) $ (24.4) (40.1) $ (33.7)  
Net long-term debt including current maturities 10,542.3   3,068.3    
Current portion of long-term debt 0.0   (1,309.9)    
Net long-term debt 10,542.3   1,758.4    
Revolving Credit Facility          
Debt Instrument [Line Items]          
Revolving Credit Facility 2,742.5   0.0    
Less: Debt issuance costs (15.6)   (5.9)    
Term Loan Facility          
Debt Instrument [Line Items]          
Long-term debt, gross 2,713.0   0.0    
Less: Debt issuance costs $ (28.7)   0.0    
2023 Senior Secured Notes          
Debt Instrument [Line Items]          
Coupon Interest Rate 4.333% 4.333%      
Effective Interest Rate   4.333%      
Long-term debt, gross $ 1,000.0   0.0    
Less: Debt discount (4.7)   0.0    
Less: Debt issuance costs $ (10.8)   0.0    
2021 Senior Secured Notes          
Debt Instrument [Line Items]          
Coupon Interest Rate 3.922% 3.922%      
Effective Interest Rate   3.922%      
Long-term debt, gross $ 1,000.0   0.0    
Less: Debt discount (4.3)   0.0    
Less: Debt issuance costs (9.8)   0.0    
Total Senior Secured Indebtedness          
Debt Instrument [Line Items]          
Long-term debt, gross $ 7,455.5   0.0    
2017 Senior Convertible Debt          
Debt Instrument [Line Items]          
Coupon Interest Rate 1.625%        
Effective Interest Rate 6.00%        
Fair value of liability component at issuance $ 1,396.3        
Long-term debt, gross 2,070.0   2,070.0    
Less: Debt discount (575.7)   (616.3)    
Less: Debt issuance costs $ (15.0)   (16.1)    
2015 Senior Convertible Debt          
Debt Instrument [Line Items]          
Coupon Interest Rate 1.625%        
Effective Interest Rate 5.90%        
Fair value of liability component at issuance $ 1,160.1        
Long-term debt, gross 1,725.0   1,725.0    
Less: Debt discount (363.9)   (400.3)    
Less: Debt issuance costs $ (13.3)   (14.8)    
2017 Junior Convertible Debt          
Debt Instrument [Line Items]          
Coupon Interest Rate 2.25%        
Effective Interest Rate 7.40%        
Fair value of liability component at issuance $ 321.1        
Long-term debt, gross 686.3   686.3    
Less: Debt discount (349.4)   (356.3)    
Less: Debt issuance costs $ (3.3)   $ (3.3)   $ (30.3)