Tangible Equity Units (Allocation of TEU) (Details)	Sep. 17, 2018 USD ($)
Tangible Equity Units [Line Items]
Fair Value per TEU	$ 8.4529
Gross Proceeds	825,000,000
Less: Issuance costs	26,000,000
Net Proceeds	799,000,000
SPC
Tangible Equity Units [Line Items]
Fair Value per TEU	0
Gross Proceeds	685,500,000
Less: Issuance costs	21,600,000
Net Proceeds	663,900,000
Amortizing Note
Tangible Equity Units [Line Items]
Fair Value per TEU	0
Gross Proceeds	139,500,000
Less: Issuance costs	4,400,000
Net Proceeds	$ 135,100,000