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Debt Obligations (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Mar. 31, 2017
Feb. 28, 2017
Feb. 28, 2015
Debt Instrument [Line Items]        
Long-term debt, gross $ 4,481.3 $ 4,513.8    
Total Convertible Debt 4,481.3 4,513.8    
Amount of unamortized debt discount of debentures (1,372.9) (1,516.5)    
Debt issuance amortization (40.1) (46.8) $ (33.7)  
Net long-term debt including current maturities 3,068.3 2,950.5    
Less: Current maturities (1,309.9) (50.0)    
Net long-term debt 1,758.4 2,900.5    
December 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020        
Debt Instrument [Line Items]        
Credit Facility 0.0 0.0    
Debt issuance amortization $ (5.9) (8.5)    
2017 Senior Subordinated Convertible Debt        
Debt Instrument [Line Items]        
Coupon Interest Rate 1.625%      
Debt Instrument, Interest Rate, Effective Percentage 5.97%      
Estimated Fair Value Of Liability Component Of Debentures On Issuance Date $ 1,396.3      
Long-term debt, gross 2,070.0 2,070.0    
Amount of unamortized debt discount of debentures (616.3) (667.5)    
Debt issuance amortization $ (16.1) (17.6)    
2015 Senior Subordinated Convertible Debt        
Debt Instrument [Line Items]        
Coupon Interest Rate 1.625%      
Debt Instrument, Interest Rate, Effective Percentage 5.90%      
Estimated Fair Value Of Liability Component Of Debentures On Issuance Date $ 1,160.1      
Long-term debt, gross 1,725.0 1,725.0    
Amount of unamortized debt discount of debentures (400.3) (446.6)    
Debt issuance amortization $ (14.8) (16.6)   $ (30.3)
2017 Junior Subordinated Convertible Debt        
Debt Instrument [Line Items]        
Coupon Interest Rate 2.25%      
Debt Instrument, Interest Rate, Effective Percentage 7.37%      
Estimated Fair Value Of Liability Component Of Debentures On Issuance Date $ 321.1      
Long-term debt, gross 686.3 575.0    
Amount of unamortized debt discount of debentures (356.3) (309.3)    
Debt issuance amortization $ (3.3) (3.4)    
2007 Junior Subordinated Convertible Notes        
Debt Instrument [Line Items]        
Coupon Interest Rate 2.125%      
Debt Instrument, Interest Rate, Effective Percentage 9.10%      
Estimated Fair Value Of Liability Component Of Debentures On Issuance Date $ 0.0      
Long-term debt, gross 0.0 143.8    
Amount of unamortized debt discount of debentures 0.0 (93.1)    
Debt issuance amortization $ 0.0 $ (0.7)