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Debt - 2027 Notes (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Proceeds from the issuance of senior notes			$ 0	$ 744,700,000	$ 0
Loss on extinguishment of debt		$ (21,200,000)	0	21,200,000	0
Debt issuance costs			$ 0	$ 11,900,000	$ 0
Senior Notes | 2027 Notes
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount	$ 750,000,000.0
Stated interest rate	3.80%		3.80%
Percentage of par	99.294%
Debt interest rate, effective percentage	3.885%		3.885%	3.885%
Proceeds from the issuance of senior notes	$ 744,700,000
Debt issuance costs	6,000,000
Senior Notes | 2027 Notes | Prior to June 15, 2027
Debt Instrument [Line Items]
Percentage of par			100.00%
Senior Notes | 2027 Notes | On or After June 15, 2027
Debt Instrument [Line Items]
Percentage of par			100.00%
Senior Notes | 2023 Notes
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount	$ 500,000,000.0
Percentage of par	100.00%
Make-whole premium	$ 17,000,000
Loss on extinguishment of debt	21,200,000
Credit Agreement | Prior Term Loan Facility | Term Loan Facility
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount	$ 500,000,000.0

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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