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Debt (Schedule of Convertible Senior Subordinated Notes) (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Debt Instrument [Line Items]
Principal amount of debt outstanding		$ 3,107.5	$ 786.0
Unamortized discount & debt issuance costs		(0.5)	(0.4)
Convertible Senior Subordinated Notes
Debt Instrument [Line Items]
Principal amount converted		41.9	16.2	$ 24.2
Principal amount of debt outstanding		60.0	101.9
Unamortized discount & debt issuance costs		0.0	(1.9)
Net carrying amount		60.0	100.0
January 2012 Notes | Convertible Senior Subordinated Notes
Debt Instrument [Line Items]
Principal amount converted		41.9	0.0	$ 0.0
Principal amount of debt outstanding	[1]	0.0	41.9
Unamortized discount & debt issuance costs	[1]	0.0	(1.9)
Net carrying amount	[1]	$ 0.0	40.0
Coupon rate		4.00%
April 2013 Notes | Convertible Senior Subordinated Notes
Debt Instrument [Line Items]
Principal amount of debt outstanding		$ 60.0	60.0
Unamortized discount & debt issuance costs		0.0	0.0
Net carrying amount		$ 60.0	$ 60.0
Coupon rate		1.25%
Conversion price per share (in usd per share)		$ 29.19
[1] In January 2017, the outstanding principal amount of the Company's January 2012 4.00% Notes was converted into Class A voting shares and Class B non-voting shares, see table below.

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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