Debt (Components of Total Indebtedness) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019
Debt Instrument [Line Items]
Principal Amount	$ 8,462,141,000	$ 8,470,678,000
Carrying Amount	8,389,070,000	8,394,049,000		$ 1,624,000,000.0
Less current portion, net	34,150,000	34,150,000
Principal amount of total long-term debt, less current portion, net	8,427,991,000	8,436,528,000
Carrying amount of total long-term debt, less current portion, net	8,354,920,000	8,359,899,000
Fair value of long term debt	$ 7,200,000,000	$ 7,400,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Effective interest rate (as percent)	4.13%	4.25%
Principal Amount	$ 300,000,000	$ 300,000,000	$ 300,000,000.0
Carrying Amount	$ 300,000,000	$ 300,000,000
7.25% Senior Notes due 2022
Debt Instrument [Line Items]
Effective interest rate (as percent)	7.25%	7.25%
Principal Amount	$ 8,294,000	$ 8,294,000
Carrying Amount	$ 8,294,000	$ 8,294,000
Interest rate (as percent)	7.25%			7.25%
5.75% Senior Notes due 2022
Debt Instrument [Line Items]
Effective interest rate (as percent)	5.75%	5.75%
Principal Amount	$ 182,479,000	$ 182,479,000
Carrying Amount	$ 182,479,000	$ 182,479,000
Interest rate (as percent)	5.75%			5.75%
5.375% Senior Notes due 2023
Debt Instrument [Line Items]
Effective interest rate (as percent)	5.62%	5.62%
Principal Amount	$ 210,440,000	$ 210,440,000
Carrying Amount	$ 209,126,000	$ 209,018,000
Interest rate (as percent)	5.375%
6.00% Senior Notes due 2023
Debt Instrument [Line Items]
Effective interest rate (as percent)	6.28%	6.28%
Principal Amount	$ 1,439,840,000	$ 1,439,840,000
Carrying Amount	$ 1,427,814,000	$ 1,426,998,000
Interest rate (as percent)	6.00%
5.875% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Effective interest rate (as percent)	6.14%	6.14%
Principal Amount	$ 300,000,000	$ 300,000,000
Carrying Amount	$ 296,798,000	$ 296,647,000
Interest rate (as percent)	5.875%
6.00% Senior Notes due 2025
Debt Instrument [Line Items]
Effective interest rate (as percent)	6.27%	6.27%
Principal Amount	$ 1,200,000,000	$ 1,200,000,000
Carrying Amount	$ 1,186,326,000	$ 1,185,726,000
Interest rate (as percent)	6.00%
7.50% Senior Secured Notes due 2027
Debt Instrument [Line Items]
Effective interest rate (as percent)	7.71%	7.71%
Principal Amount	$ 1,500,000,000	$ 1,500,000,000		$ 1,500,000,000.0
Carrying Amount	$ 1,482,675,000	$ 1,482,212,000
Interest rate (as percent)	7.50%			7.50%
Term Loan Facility
Debt Instrument [Line Items]
Effective interest rate (as percent)	6.09%	6.21%
Principal Amount	$ 3,321,088,000	$ 3,329,625,000
Carrying Amount	$ 3,295,558,000	$ 3,302,675,000