Debt and Credit Facility Credit Facility (Details)		1 Months Ended			3 Months Ended
		Jun. 30, 2017 USD ($)	Feb. 28, 2017 USD ($)	Feb. 28, 2015 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2017 USD ($)
Line of Credit Facility [Line Items]
Interest coverage ratio		3.50			3.50
Repayments of lines of credit	[1]				$ 60,000,000	$ 602,000,000
Debt issuance costs		$ 44,700,000	$ 33,700,000		44,700,000		$ 46,800,000
Interest expense					49,490,000	34,416,000
December 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020
Line of Credit Facility [Line Items]
Debt issuance costs		7,700,000			7,700,000		8,500,000
Credit Facility		0			0		$ 0
December 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 | Revolving credit facility
Line of Credit Facility [Line Items]
Credit agreement maximum borrowing amount		$ 2,774,000,000.000			$ 2,774,000,000.000
Credit agreement, total leverage ratio, maximum		5.00			5.00		5.00
Credit Agreement, total consolidated debt, maximum		$ 700,000,000			$ 700,000,000
Credit agreement, total leverage ratio, temporary maximum allowed, first four quarters		5.50			5.50
Credit agreement, total leverage ratio, temporary maximum allowed, next three quarters		5.25			5.25
Credit agreement, senior leverage ratio, maximum		3.50			3.50
Credit agreement, senior leverage ratio, minimum to obtain additional funding		2.50			2.50
Repayments of lines of credit			1,682,500,000
Debt issuance costs			2,100,000
2007 Junior Subordinated Convertible Debt
Line of Credit Facility [Line Items]
Debt issuance costs		$ 100,000			$ 100,000		$ 700,000
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020
Line of Credit Facility [Line Items]
Credit Facility		$ 0			$ 0		$ 0
Debt instrument, description of variable rate basis					the highest of JPMorgan Chase Bank, N.A.'s prime rate, the federal funds rate plus a margin equal to 0.50% and the adjusted LIBOR rate for a 1-month interest period plus a margin equal to 1.00%
Interest expense					$ 2,700,000	$ 11,600,000
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 | Revolving credit facility
Line of Credit Facility [Line Items]
Interest rate spread on overdue principal in event of default (percentage)		2.00%			2.00%
Interest rate spread on overdue amounts in event of default (percentage)		2.00%			2.00%
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 | Foreign line of credit
Line of Credit Facility [Line Items]
Credit agreement maximum borrowing amount		$ 125,000,000			$ 125,000,000
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 | Standby letters of credit
Line of Credit Facility [Line Items]
Credit agreement maximum borrowing amount		25,000,000			25,000,000
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 | Line of credit facility swingline loan sublimit
Line of Credit Facility [Line Items]
Credit agreement maximum borrowing amount		25,000,000			$ 25,000,000
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 | Line of credit
Line of Credit Facility [Line Items]
Period for leverage ratio to determine interest rate spread					preceding four fiscal quarters
Debt instrument interest rate option 2 | February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 | Line of credit
Line of Credit Facility [Line Items]
Debt instrument, description of variable rate basis					adjusted LIBOR rate (based on one, two, three, or six-month interest periods)
Minimum | Debt instrument interest rate option 1 | February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 | Revolving credit facility
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)					0.25%
Maximum | Debt instrument interest rate option 1 | February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 | Revolving credit facility
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)					1.25%
Maximum | Debt instrument interest rate option 2 | February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 | Line of credit
Line of Credit Facility [Line Items]
Spread on variable rate (percentage)					2.25%
Long-term Debt | 2007 Junior Subordinated Convertible Debt
Line of Credit Facility [Line Items]
Extinguishment of debt		$ 111,300,000	$ 431,300,000	$ 575,000,000

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