Guarantor Subsidiaries (Consolidating Statement of Changes In Equity) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 918,000	$ 746,800	$ 803,000	$ 816,300	$ 797,800	$ 807,300	$ 803,000	$ 807,300
Issuance of treasury stock	0		(500)	0	0	0
Repurchase of treasury stock	(89,900)	0	(140,600)	(109,000)	(16,800)	(13,300)
Amounts related to share-based compensation	(5,100)	0	(5,600)	(100)	(200)	(4,100)
Share-based compensation expense	5,400	2,800	2,800	2,600	2,800	2,600
Net income	66,900	168,900	89,300	69,200	32,700	5,300	325,100	107,200
Ending balance	895,700	918,000	746,800	779,000	816,300	797,800	895,700	779,000
Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,100				1,100
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	500	500	500	500	500	500	500	500
Issuance of common stock	0	0	0	0	0	0
Ending balance	500	500	500	500	500	500	500	500
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,235,200)	(1,235,200)	(1,099,800)	(964,700)	(948,000)	(940,300)	(1,099,800)	(940,300)
Issuance of treasury stock	3,300	0	5,200	500	100	5,600
Repurchase of treasury stock	(89,900)	0	(140,600)	(109,000)	(16,800)	(13,300)
Ending balance	(1,321,800)	(1,235,200)	(1,235,200)	(1,073,200)	(964,700)	(948,000)	(1,321,800)	(1,073,200)
APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	533,000	530,200	538,700	534,400	531,900	539,000	538,700	539,000
Issuance of treasury stock	(3,300)	0	(5,700)	(500)	(100)	(5,600)
Amounts related to share-based compensation	(5,100)	0	(5,600)	(100)	(200)	(4,100)
Share-based compensation expense	5,400	2,800	2,800	2,600	2,800	2,600
Ending balance	530,000	533,000	530,200	536,400	534,400	531,900	530,000	536,400
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,622,200	1,453,300	1,362,900	1,246,100	1,213,400	1,208,100	1,362,900	1,208,100
Net income	66,900	168,900	89,300	69,200	32,700	5,300
Ending balance	1,689,100	1,622,200	1,453,300	1,315,300	1,246,100	1,213,400	1,689,100	1,315,300
Retained Earnings \| Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,100				1,100
AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,500)	(2,000)	700	0	0	0	700	0
Other comprehensive income (loss)			(2,700)	0	0	0
Net income	400	(500)
Ending balance	(2,100)	(2,500)	(2,000)	0	0	0	(2,100)	0
Eliminations
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(2,735,700)				(2,735,700)
Net income	(66,700)			(69,100)			(324,600)	(106,800)
Ending balance	(3,060,300)						(3,060,300)
Eliminations \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(100)	(100)	(100)	(100)	(100)	(100)	(100)	(100)
Ending balance	(100)	(100)	(100)	(100)	(100)	(100)	(100)	(100)
Eliminations \| Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Eliminations \| APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)
Ending balance	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)
Eliminations \| Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,625,100)	(1,456,400)	(1,367,200)	(1,250,600)	(1,218,000)	(1,212,900)	(1,367,200)	(1,212,900)
Net income	(66,700)	(168,700)	(89,200)	(69,100)	(32,600)	(5,100)
Ending balance	(1,691,800)	(1,625,100)	(1,456,400)	(1,319,700)	(1,250,600)	(1,218,000)	(1,691,800)	(1,319,700)
Eliminations \| AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Parent Company \| Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			2,591,900				2,591,900
Net income	66,900			69,200			325,100	107,200
Ending balance	2,686,000						2,686,000
Parent Company \| Reportable Legal Entities \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	500	500	500	500	500	500	500	500
Ending balance	500	500	500	500	500	500	500	500
Parent Company \| Reportable Legal Entities \| Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,235,200)	(1,235,200)	(1,099,800)	(964,700)	(948,000)	(940,300)	(1,099,800)	(940,300)
Issuance of treasury stock	3,300	0	5,200	500	100	5,600
Repurchase of treasury stock	(89,900)	0	(140,600)	(109,000)	(16,800)	(13,300)
Ending balance	(1,321,800)	(1,235,200)	(1,235,200)	(1,073,200)	(964,700)	(948,000)	(1,321,800)	(1,073,200)
Parent Company \| Reportable Legal Entities \| APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,183,100	1,183,100	1,188,800	1,189,400	1,189,500	1,195,100	1,188,800	1,195,100
Issuance of treasury stock	(3,300)	0	(5,700)	(500)	(100)	(5,600)
Ending balance	1,179,800	1,183,100	1,183,100	1,188,900	1,189,400	1,189,500	1,179,800	1,188,900
Parent Company \| Reportable Legal Entities \| Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2,760,600	2,591,700	2,502,400	2,219,800	2,187,100	2,181,800	2,502,400	2,181,800
Net income	66,900	168,900	89,300	69,200	32,700	5,300
Ending balance	2,827,500	2,760,600	2,591,700	2,289,000	2,219,800	2,187,100	2,827,500	2,289,000
Parent Company \| Reportable Legal Entities \| AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Issuer \| Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			741,400				741,400
Net income	66,900			69,200			325,100	107,200
Ending balance	1,065,100						1,065,100
Issuer \| Reportable Legal Entities \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Issuer \| Reportable Legal Entities \| Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Issuer \| Reportable Legal Entities \| APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	578,800	576,000	578,800	573,900	571,300	572,800	578,800	572,800
Amounts related to share-based compensation	(5,100)	0	(5,600)	(100)	(200)	(4,100)
Share-based compensation expense	5,400	2,800	2,800	2,600	2,800	2,600
Ending balance	579,100	578,800	576,000	576,400	573,900	571,300	579,100	576,400
Issuer \| Reportable Legal Entities \| Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	421,200	252,300	161,900	210,900	178,200	172,900	161,900	172,900
Net income	66,900	168,900	89,300	69,200	32,700	5,300
Ending balance	488,100	421,200	252,300	280,100	210,900	178,200	488,100	280,100
Issuer \| Reportable Legal Entities \| Retained Earnings \| Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,100				1,100
Issuer \| Reportable Legal Entities \| AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,500)	(2,000)	700	0	0	0	700	0
Other comprehensive income (loss)			(2,700)
Net income		(500)
Ending balance	(2,100)	(2,500)	(2,000)	0	0	0	(2,100)	0
Guarantor Subsidiaries \| Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			51,100				51,100
Net income	(200)			(100)			(500)	(400)
Ending balance	50,600						50,600
Guarantor Subsidiaries \| Reportable Legal Entities \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	100	100	100	100	100	100	100	100
Ending balance	100	100	100	100	100	100	100	100
Guarantor Subsidiaries \| Reportable Legal Entities \| Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Guarantor Subsidiaries \| Reportable Legal Entities \| APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	52,000	52,000	52,000	52,000	52,000	52,000	52,000	52,000
Ending balance	52,000	52,000	52,000	52,000	52,000	52,000	52,000	52,000
Guarantor Subsidiaries \| Reportable Legal Entities \| Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,300)	(1,100)	(1,000)	(800)	(700)	(500)	(1,000)	(500)
Net income	(200)	(200)	(100)	(100)	(100)	(200)
Ending balance	(1,500)	(1,300)	(1,100)	(900)	(800)	(700)	(1,500)	(900)
Guarantor Subsidiaries \| Reportable Legal Entities \| AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Non-Guarantor Subsidiaries \| Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			154,300				154,300
Net income	0			0			0	0
Ending balance	154,300						154,300
Non-Guarantor Subsidiaries \| Reportable Legal Entities \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Non-Guarantor Subsidiaries \| Reportable Legal Entities \| Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Non-Guarantor Subsidiaries \| Reportable Legal Entities \| APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	87,500	87,500	87,500	87,500	87,500	87,500	87,500	87,500
Ending balance	87,500	87,500	87,500	87,500	87,500	87,500	87,500	87,500
Non-Guarantor Subsidiaries \| Reportable Legal Entities \| Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	66,800	66,800	66,800	66,800	66,800	66,800	66,800	66,800
Ending balance	66,800	66,800	66,800	66,800	66,800	66,800	66,800	66,800
Non-Guarantor Subsidiaries \| Reportable Legal Entities \| AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0

Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement.

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Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Value of shares of stock issued attributable to transactions classified as other.

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Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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