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Borrowings - Long-term Debt (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Amount	$ 3,865,865,000	$ 4,415,016,000
Senior Notes
Debt Instrument [Line Items]
Amount	124,241,000	124,037,000
Senior Subordinated Notes
Debt Instrument [Line Items]
Amount	181,534,000	181,394,000
Maturing September 2024 | Senior Notes
Debt Instrument [Line Items]
Amount	$ 24,612,000	24,552,000
Rate	4.50%
Issued Amount	$ 25,000,000
Price	100.00%
Maturing June 2022 | Senior Notes
Debt Instrument [Line Items]
Amount	$ 99,629,000	99,485,000
Rate	3.95%
Issued Amount	$ 100,000,000
Price	99.775%
Maturing December 2034 | Senior Subordinated Notes
Debt Instrument [Line Items]
Amount	$ 72,313,000	72,222,000
Rate	5.375%
Issued Amount	$ 74,750,000
Price	100.00%
Maturing June 2029 | Senior Subordinated Notes
Debt Instrument [Line Items]
Amount	$ 109,221,000	$ 109,172,000
Rate	6.125%
Issued Amount	$ 110,000,000
Price	100.00%
London Interbank Offered Rate (LIBOR) | Maturing June 2029 | Senior Subordinated Notes
Debt Instrument [Line Items]
Spread on variable interest rate	3.443%

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