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Debt and Credit Arrangements - Senior Secured Revolving Credit Facility and Term Loan (Details) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 14, 2019	Jul. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Debt Instrument
Payments for debt issuance costs					$ 13,600,000	$ 200,000
Revolving Credit Facility
Debt Instrument
Interest expense			$ 5,600,000	$ 2,900,000	11,400,000	8,000,000.0
Financing costs amortization			$ 800,000	100,000	$ 1,200,000	400,000
Revolving Credit Facility | Credit Facilities 2019
Debt Instrument
Maximum percentage of capital stock guaranteed by company			65.00%		65.00%
Unamortized debt issuance costs			$ 5,800,000		$ 5,800,000
Revolving Credit Facility | Credit Facilities 2019 | Adjusted Base Rate | Minimum
Debt Instrument
Debt instrument variable interest rate (percent)	0.25%
Revolving Credit Facility | Credit Facilities 2019 | Adjusted Base Rate | Maximum
Debt Instrument
Debt instrument variable interest rate (percent)	1.25%
Revolving Credit Facility | Credit Facilities 2019 | LIBOR | Minimum
Debt Instrument
Debt instrument variable interest rate (percent)	1.25%
Revolving Credit Facility | Credit Facilities 2019 | LIBOR | Maximum
Debt Instrument
Debt instrument variable interest rate (percent)	2.25%
Revolving Credit Facility | Term loan
Debt Instrument
Maximum borrowing capacity	$ 450,000,000.0
Long term debt			$ 450,000,000.0		$ 450,000,000.0
Debt instrument stated interest rate (percent)			3.29%		3.29%
Debt instrument percentage of principal due annually, through year two (percent)			2.50%		2.50%
Debt instrument percentage of principal due annually, year three (percent)			5.00%		5.00%
Debt instrument percentage of principal due annually, year four (percent)			7.50%		7.50%
Debt instrument percentage of principal due annually, year five and after (percent)			10.00%		10.00%
Ticking fee			$ 100,000		$ 100,000
Interest expense			4,600,000		4,600,000
Debt issuance costs			6,100,000		$ 6,100,000
Debt instrument, term					5 years
Revolving Credit Facility | Term loan | Minimum
Debt Instrument
Line of credit commitment fee (percent)		0.20%
Revolving Credit Facility | Term loan | Maximum
Debt Instrument
Line of credit commitment fee (percent)		0.35%
Revolving Credit Facility | Senior secured revolving credit facility
Debt Instrument
Maximum borrowing capacity	$ 550,000,000.0
Long term debt			149,800,000		$ 149,800,000
Interest expense			$ 1,000,000.0		$ 6,800,000
Line of credit fronting fee (percent)			0.125%		0.125%
Debt instrument, term					5 years
Payments for debt issuance costs					$ 7,500,000
Unamortized debt issuance costs			$ 9,500,000		$ 9,500,000
Weighted average interest rate (percent)			1.99%		1.99%
Letters of credit outstanding			$ 61,200,000		$ 61,200,000
Line of credit remaining borrowing amount			339,000,000.0		$ 339,000,000.0
Revolving Credit Facility | Senior secured revolving credit facility | Minimum
Debt Instrument
Line of credit commitment fee (percent)	0.20%
Line of credit participation fee percent)					1.25%
Revolving Credit Facility | Senior secured revolving credit facility | Maximum
Debt Instrument
Line of credit commitment fee (percent)	0.35%
Line of credit participation fee percent)					2.25%
Revolving Credit Facility | Senior secured revolving credit facility due 2022
Debt Instrument
Maximum borrowing capacity	$ 550,000,000.0
Long term debt							$ 329,300,000
Interest expense				$ 2,900,000		$ 8,000,000.0
Unamortized debt issuance costs			$ 2,500,000		$ 2,500,000
Financing costs amortization					$ 200,000
Revolving Credit Facility Sub-limit - Letters of Credit | Senior secured revolving credit facility
Debt Instrument
Maximum borrowing capacity	100,000,000.0
Revolving Credit Facility Sub-limit - Discretionary Letters of Credit | Senior secured revolving credit facility
Debt Instrument
Maximum borrowing capacity	250,000,000.0
Revolving Credit Facility Sub-limit - Swingline | Senior secured revolving credit facility
Debt Instrument
Maximum borrowing capacity	$ 50,000,000.0

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Contractual interest rate for funds borrowed, under the debt agreement.

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