Derivative Instruments - Narrative (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Notional Amount	$ 5,837,562,000
Forward foreign exchange contracts
Derivative [Line Items]
Forward foreign exchange contracts with credit risk-related contingent features, notional value	30,200,000	$ 25,700,000
Additional collateral required, if TCF was rated less than BB- by Standard and Poor's	600,000	500,000
Forward foreign exchange contracts with credit risk-related contingent features, net liability amount	0	0
Cash collateral posted	100,000
Cash collateral received	1,900,000
Interest rate contracts
Derivative [Line Items]
Cash collateral posted	58,100,000
Derivatives designated as hedges
Derivative [Line Items]
Notional Amount	321,075,000	307,271,000
Derivatives designated as hedges | Forward foreign exchange contracts
Derivative [Line Items]
Notional Amount	$ 171,075,000	157,271,000
Derivative term	34 days
Derivatives designated as hedges | Interest rate contracts
Derivative [Line Items]
Notional Amount	$ 150,000,000	150,000,000
Derivatives not designated as hedges
Derivative [Line Items]
Notional Amount	5,516,487,000	1,390,750,000
Derivatives not designated as hedges | Forward foreign exchange contracts
Derivative [Line Items]
Notional Amount	291,999,000	254,274,000
Derivatives not designated as hedges | Interest rate contracts
Derivative [Line Items]
Notional Amount	$ 4,694,964,000	1,095,449,000
Derivatives not designated as hedges | Interest rate contracts | Minimum
Derivative [Line Items]
Derivative term	27 days
Derivatives not designated as hedges | Interest rate contracts | Maximum
Derivative [Line Items]
Derivative term	16 years
Derivatives not designated as hedges | Swap agreement
Derivative [Line Items]
Notional Amount	$ 12,644,000	$ 13,020,000