Debt and Credit Facility Credit Facility (Details)			1 Months Ended	3 Months Ended
		May 18, 2018 USD ($)	May 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2018 USD ($)	Feb. 28, 2017 USD ($)
Line of Credit Facility [Line Items]
Repayments of lines of credit	[1]			$ 151,500,000	$ 60,000,000
Debt issuance costs			$ 24,400,000	110,000,000		$ 40,100,000	$ 33,700,000
Revolving Credit Facility						0
Interest expense				90,400,000	49,500,000
Term Loan Facility
Line of Credit Facility [Line Items]
Debt issuance costs				34,200,000		0
Revolving credit facility
Line of Credit Facility [Line Items]
Credit agreement maximum borrowing amount		$ 3,840,000,000	3,840,000,000.00			$ 3,122,000,000.000
Credit Agreement, total consolidated debt, maximum				$ 700,000,000
Interest coverage ratio				3.25
Additional borrowing capacity				$ 10,000,000
Debt issuance costs			13,600,000
Interest expense				$ 14,800,000	$ 2,700,000
Interest rate spread on overdue principal in event of default (percentage)				2.00%
Interest rate spread on overdue amounts in event of default (percentage)				2.00%
Revolving credit facility | 2020 Tranche
Line of Credit Facility [Line Items]
Credit agreement maximum borrowing amount		244,300,000
Revolving credit facility | 2023 Tranche
Line of Credit Facility [Line Items]
Credit agreement maximum borrowing amount		3,600,000,000
Revolving credit facility | Term Loan Facility
Line of Credit Facility [Line Items]
Quarterly amortization payments, percent				0.25%
Proceeds from borrowings on Term Loan Facility			3,000,000,000
Debt issuance costs			$ 34,700,000
Foreign line of credit
Line of Credit Facility [Line Items]
Credit agreement maximum borrowing amount		250,000,000
Standby letters of credit
Line of Credit Facility [Line Items]
Credit agreement maximum borrowing amount		50,000,000
Line of credit facility swingline loan sublimit
Line of Credit Facility [Line Items]
Credit agreement maximum borrowing amount		$ 25,000,000
Base Rate | Minimum | Revolving credit facility | 2020 Tranche
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)		0.25%
Base Rate | Minimum | Revolving credit facility | 2023 Tranche
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)		0.00%
Base Rate | Maximum | Revolving credit facility | 2020 Tranche
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)		1.25%
Base Rate | Maximum | Revolving credit facility | 2023 Tranche
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)		1.00%
London Interbank Offered Rate (LIBOR) | Minimum | Revolving credit facility | 2020 Tranche
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)		1.25%
London Interbank Offered Rate (LIBOR) | Minimum | Revolving credit facility | 2023 Tranche
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)		1.00%
London Interbank Offered Rate (LIBOR) | Maximum | Revolving credit facility | 2020 Tranche
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)		2.25%
London Interbank Offered Rate (LIBOR) | Maximum | Revolving credit facility | 2023 Tranche
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)		2.00%
Leverage Ratio Percent One | Revolving credit facility
Line of Credit Facility [Line Items]
Credit agreement, total leverage ratio, maximum				6.75
Credit agreement, total leverage ratio, temporary maximum allowed, next three quarters				4.75
Leverage Ratio Percent One | Revolving credit facility | 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]
Credit agreement, total leverage ratio, maximum				6.25
Credit agreement, total leverage ratio, temporary maximum allowed, next three quarters				4.25
Leverage Ratio Percent Two | Revolving credit facility | 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]
Credit agreement, total leverage ratio, maximum				5.75
Credit agreement, total leverage ratio, temporary maximum allowed, next three quarters				3.75
Credit agreement, senior leverage ratio, minimum to obtain additional funding				4.25
Leverage Ratio Percent Three | Revolving credit facility | Term Loan Facility
Line of Credit Facility [Line Items]
Mandatory prepayment of excess cash flow, percentage				0.00%
Leverage Ratio Percent Four | Revolving credit facility
Line of Credit Facility [Line Items]
Credit agreement, senior leverage ratio, minimum to obtain additional funding				3.75

[1] During the three months ended June 30, 2017, the Company issued $111.3 million principal amount of 2017 Junior Convertible Debt and 3.2 million shares of common stock in exchange for $111.3 million principal amount of 2007 Junior Convertible Debt. Refer to Note 13 Debt and Credit Facility for further discussion.