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Debt (Narrative - 5.875% Senior Notes) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2017
Oct. 27, 2016
Mar. 31, 2016
Debt Instrument [Line Items]      
Discount Rate, Basis Spread on Treasury Rate 0.50%    
Principal amount of debt outstanding $ 3,107.5   $ 786.0
5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Coupon rate 5.875%    
Principal amount issued   $ 520.0  
Principal amount of debt outstanding $ 520.0   $ 0.0
Debt instrument redemption premium percentage, as a percentage of principal amount prepaid or redeemed 1.00%    
Prior to November 1, 2019 | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 100.00%    
On or after November 1, 2019 | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 104.406%    
On or after November 1, 2020 | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 102.938%    
On or after November 1, 2021 | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 101.439%    
On or after November 1, 2022 | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 100.00%    
Change in Control | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 101.00%    
Certain Asset Disposition | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 100.00%