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Debt (Schedule of Debt) (Details) - USD ($)
$ / shares in Units, $ in Millions
Sep. 30, 2017
Mar. 31, 2017
Debt Instrument [Line Items]    
Corporate debt $ 2,407.5 $ 3,107.5
Convertible senior subordinated notes [1] 60.0 60.0
Capital lease obligations 53.7 57.7
Total debt 2,521.2 3,225.2
Unamortized discount and debt issuance costs, net of fair value adjustment on capital lease obligations (74.7) (100.3)
Total debt, net 2,446.5 3,124.9
Less current portion (77.8) (77.9)
Non-current portion of debt 2,368.7 3,047.0
Revolving Credit Facility    
Debt Instrument [Line Items]    
Corporate debt 0.0 0.0
Convertible Senior Subordinated Notes    
Debt Instrument [Line Items]    
Less current portion (77.8) (77.9)
Non-current portion of debt $ 2,368.7 3,047.0
Coupon rate 1.25%  
Conversion price per share (in usd per share) $ 29.19  
Term Loan A Facility | Term Loan    
Debt Instrument [Line Items]    
Corporate debt $ 962.5 987.5
Term Loan B Facility | Term Loan    
Debt Instrument [Line Items]    
Corporate debt 925.0 1,600.0
5.875% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Corporate debt $ 520.0 $ 520.0
Coupon rate 5.875%  
[1] Represents 1.25% convertible senior subordinated notes due April 2018, with a conversion price of $29.19 per share at September 30, 2017.