Debt and Credit Facility - Credit Facility (Details) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	May 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Mar. 31, 2018
Line of Credit Facility [Line Items]
Debt issuance amortization	$ 24,400,000	$ 77,600,000		$ 83,600,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	3,840,000,000	3,600,000,000		3,600,000,000	$ 3,120,000,000
Debt issuance amortization	13,600,000
Extinguishment of debt, amount				244,300,000
Proceeds from borrowings on revolving loan under credit facility		204,000,000.0	$ 3,485,500,000
Total consolidated debt, maximum		$ 700,000,000
Interest coverage ratio, less than		3.25
Interest rate spread on overdue principal in event of default		2.00%
Interest rate spread on overdue amounts in event of default		2.00%
Term Loan Facility
Line of Credit Facility [Line Items]
Debt issuance amortization	34,700,000
Proceeds from borrowings on term loan facility	$ 3,000,000,000.0
Quarterly amortization payments, percent		0.25%
Repayments of long-term debt		$ 188,000,000.0		1,090,000,000.00
Proceeds from borrowings on revolving loan under credit facility		0	$ 3,000,000,000.0	500,000,000.0
Loss on settlement of debt		1,900,000		$ 11,500,000
Foreign Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		250,000,000.0
Standby Letters of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		50,000,000.0
Line of Credit Facility Swingline Loan Sublimit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		25,000,000.0
2023 Tranche | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 3,600,000,000
Leverage Ratio Percent One | Revolving Credit Facility
Line of Credit Facility [Line Items]
Total leverage ratio, maximum		6.75
Total leverage ratio, temporary maximum allowed, next three quarters		4.75
Leverage Ratio Percent One | Term Loan Facility
Line of Credit Facility [Line Items]
Mandatory prepayment of excess cash flow, percentage		50.00%
Leverage Ratio Percent Two | Revolving Credit Facility
Line of Credit Facility [Line Items]
Total leverage ratio, maximum		6.25
Total leverage ratio, temporary maximum allowed, next three quarters		4.25
Leverage Ratio Percent Two | Term Loan Facility
Line of Credit Facility [Line Items]
Mandatory prepayment of excess cash flow, percentage		25.00%
Leverage Ratio Percent Three | Revolving Credit Facility
Line of Credit Facility [Line Items]
Total leverage ratio, maximum		5.75
Total leverage ratio, temporary maximum allowed, next three quarters		3.75
Leverage Ratio Percent Three | Term Loan Facility
Line of Credit Facility [Line Items]
Mandatory prepayment of excess cash flow, percentage		0.00%
Minimum | Base Rate | 2023 Tranche | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.00%
Minimum | London Interbank Offered Rate (LIBOR) | 2023 Tranche | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.00%
Maximum | Base Rate | 2023 Tranche | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.00%
Maximum | London Interbank Offered Rate (LIBOR) | 2023 Tranche | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate		2.00%