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Debt and Credit Facility Debt Obligations (Details) - USD ($)
$ in Millions
Jun. 30, 2018
May 31, 2018
Mar. 31, 2018
Feb. 28, 2017
Feb. 28, 2015
Debt Instrument [Line Items]          
Revolving Credit Facility     $ 0.0    
Long-term debt, gross $ 12,815.3   4,481.3    
Total Convertible Debt 4,481.3   4,481.3    
Less: Debt discount (1,355.7) $ (10.5) (1,372.9)    
Less: Debt issuance costs (110.0) $ (24.4) (40.1) $ (33.7)  
Net long-term debt including current maturities 11,349.6   3,068.3    
Current portion of long-term debt (1,329.8)   (1,309.9)    
Net long-term debt 10,019.8   1,758.4    
December 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020          
Debt Instrument [Line Items]          
Revolving Credit Facility 3,334.0   0.0    
Less: Debt issuance costs (18.6)   (5.9)    
Term Loan Facility          
Debt Instrument [Line Items]          
Long-term debt, gross 3,000.0   0.0    
Less: Debt issuance costs $ (34.2)   0.0    
2023 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 (5.2)   0.0    
Less: Debt issuance costs $ (12.0)   0.0    
2021 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 (5.1)   0.0    
Less: Debt issuance costs (11.8)   0.0    
Senior Notes          
Debt Instrument [Line Items]          
Long-term debt, gross $ 8,334.0   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) $ 1,396.3        
Long-term debt, gross 2,070.0   2,070.0    
Less: Debt discount (602.9)   (616.3)    
Less: Debt issuance costs $ (15.8)   (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) $ 1,160.1        
Long-term debt, gross 1,725.0   1,725.0    
Less: Debt discount (388.4)   (400.3)    
Less: Debt issuance costs $ (14.3)   (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 (1) $ 321.1        
Long-term debt, gross 686.3   686.3    
Less: Debt discount (354.1)   (356.3)    
Less: Debt issuance costs $ (3.3)   $ (3.3)   $ (30.3)