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Debt (Conversions of Convertible Senior Subordinated Notes) (Details) - Convertible Senior Subordinated Notes - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Debt Instrument [Line Items]      
Principal amount converted $ 41.9 $ 16.2 $ 24.2
Common shares issued upon conversion (in shares) 4,098,922 1,983,058 2,945,730
Weighted average conversion price per share (in usd per share) $ 10.21 $ 8.15 $ 8.20
January 2012 Notes      
Debt Instrument [Line Items]      
Principal amount converted $ 41.9 $ 0.0 $ 0.0
Weighted average conversion price per share (in usd per share) $ 10.21 $ 0.00 $ 0.00
Coupon rate 4.00%    
April 2009 Notes      
Debt Instrument [Line Items]      
Principal amount converted $ 0.0 $ 16.2 $ 24.1
Common shares issued upon conversion (in shares) 0 1,983,058 2,937,096
Weighted average conversion price per share (in usd per share) $ 0.00 $ 8.15 $ 8.19
Coupon rate 3.625%    
October 2004 Notes [Member]      
Debt Instrument [Line Items]      
Principal amount converted $ 0.0 $ 0.0 $ 0.1
Common shares issued upon conversion (in shares) 0 0 8,634
Weighted average conversion price per share (in usd per share) $ 0.00 $ 0.00 $ 11.46
Coupon rate 2.9375%    
Class A Voting Shares | January 2012 Notes      
Debt Instrument [Line Items]      
Common shares issued upon conversion (in shares) 2,049,461 0 0
Class B Non-Voting Shares | January 2012 Notes      
Debt Instrument [Line Items]      
Common shares issued upon conversion (in shares) 2,049,461 0 0