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Guarantor Subsidiaries (Consolidating Statement Of Changes In Equity) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				$ 807.3				$ 738.4	$ 807.3	$ 738.4	$ 697.0
Issuance of treasury stock											0.1
Issuance of common stock									0.0	0.0	0.0
Purchase of treasury stock									(165.8)	(144.4)	(206.0)
Amounts related to share-based compensation									(4.5)	(9.4)	(5.6)
Share-based compensation expense									10.5	9.1	7.6
Net income	$ 47.6	$ 69.2	$ 32.7	5.3	$ 77.5	$ 45.0	$ 51.8	39.3	154.8	213.6	245.3
Balance	803.0				807.3				803.0	807.3	738.4
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.5				0.5	0.5	0.5	0.5
Issuance of common stock									0.0	0.0	0.0
Balance	0.5				0.5				0.5	0.5	0.5
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(940.3)				(806.5)	(940.3)	(806.5)	(608.0)
Issuance of treasury stock									6.3	10.6	7.5
Purchase of treasury stock									(165.8)	(144.4)	(206.0)
Balance	(1,099.8)				(940.3)				(1,099.8)	(940.3)	(806.5)
APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				539.0				549.9	539.0	549.9	555.3
Issuance of treasury stock									(6.3)	(10.6)	(7.4)
Amounts related to share-based compensation									(4.5)	(9.4)	(5.6)
Share-based compensation expense									10.5	9.1	7.6
Balance	538.7				539.0				538.7	539.0	549.9
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				1,208.1				994.5	1,208.1	994.5	749.2
Net income									154.8	213.6	245.3
Balance	1,362.9				1,208.1				1,362.9	1,208.1	994.5
AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.0				0.0	0.0	0.0	0.0
Other comprehensive income									0.7	0.0	0.0
Balance	0.7				0.0				0.7	0.0	0.0
Eliminations
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(2,581.4)					(2,581.4)
Net income									(154.3)	(213.1)	(245.3)
Balance	(2,735.7)				(2,581.4)				(2,735.7)	(2,581.4)
Eliminations \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(0.1)				(0.1)	(0.1)	(0.1)	(0.1)
Issuance of common stock									0.0	0.0	0.0
Balance	(0.1)				(0.1)				(0.1)	(0.1)	(0.1)
Eliminations \| Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.0				0.0	0.0	0.0	0.0
Issuance of treasury stock									0.0	0.0	0.0
Purchase of treasury stock									0.0	0.0	0.0
Balance	0.0				0.0				0.0	0.0	0.0
Eliminations \| APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(1,368.4)				(1,368.4)	(1,368.4)	(1,368.4)	(1,368.4)
Issuance of treasury stock									0.0	0.0	0.0
Amounts related to share-based compensation									0.0	0.0	0.0
Share-based compensation expense									0.0	0.0	0.0
Balance	(1,368.4)				(1,368.4)				(1,368.4)	(1,368.4)	(1,368.4)
Eliminations \| Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(1,212.9)				(999.8)	(1,212.9)	(999.8)	(754.5)
Net income									(154.3)	(213.1)	(245.3)
Balance	(1,367.2)				(1,212.9)				(1,367.2)	(1,212.9)	(999.8)
Eliminations \| AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.0				0.0	0.0	0.0	0.0
Other comprehensive income									0.0	0.0	0.0
Balance	0.0				0.0				0.0	0.0	0.0
Parent Company \| Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				2,437.1					2,437.1
Net income									320.6	1,187.3	245.3
Balance	2,591.9				2,437.1				2,591.9	2,437.1
Parent Company \| Reportable Legal Entities \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.5				0.5	0.5	0.5	0.5
Issuance of common stock									0.0	0.0	0.0
Balance	0.5				0.5				0.5	0.5	0.5
Parent Company \| Reportable Legal Entities \| Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(940.3)				(806.5)	(940.3)	(806.5)	(608.0)
Issuance of treasury stock									6.3	10.6	7.5
Purchase of treasury stock									(165.8)	(144.4)	(206.0)
Balance	(1,099.8)				(940.3)				(1,099.8)	(940.3)	(806.5)
Parent Company \| Reportable Legal Entities \| APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				1,195.1				1,205.7	1,195.1	1,205.7	1,213.1
Issuance of treasury stock									(6.3)	(10.6)	(7.4)
Amounts related to share-based compensation									0.0	0.0	0.0
Share-based compensation expense									0.0	0.0	0.0
Balance	1,188.8				1,195.1				1,188.8	1,195.1	1,205.7
Parent Company \| Reportable Legal Entities \| Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				2,181.8				994.5	2,181.8	994.5	749.2
Net income									320.6	1,187.3	245.3
Balance	2,502.4				2,181.8				2,502.4	2,181.8	994.5
Parent Company \| Reportable Legal Entities \| AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.0				0.0	0.0	0.0	0.0
Other comprehensive income									0.0	0.0	0.0
Balance	0.0				0.0				0.0	0.0	0.0
Issuer \| Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				745.7					745.7
Net income									(11.0)	(760.1)	245.3
Balance	741.4				745.7				741.4	745.7
Issuer \| Reportable Legal Entities \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.0				0.0	0.0	0.0	0.0
Issuance of common stock									0.0	0.0	0.0
Balance	0.0				0.0				0.0	0.0	0.0
Issuer \| Reportable Legal Entities \| Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.0				0.0	0.0	0.0	0.0
Issuance of treasury stock									0.0	0.0	0.0
Purchase of treasury stock									0.0	0.0	0.0
Balance	0.0				0.0				0.0	0.0	0.0
Issuer \| Reportable Legal Entities \| APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				572.8				573.1	572.8	573.1	571.1
Issuance of treasury stock									0.0	0.0	0.0
Amounts related to share-based compensation									(4.5)	(9.4)	(5.6)
Share-based compensation expense									10.5	9.1	7.6
Balance	578.8				572.8				578.8	572.8	573.1
Issuer \| Reportable Legal Entities \| Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				172.9				933.0	172.9	933.0	687.7
Net income									(11.0)	(760.1)	245.3
Balance	161.9				172.9				161.9	172.9	933.0
Issuer \| Reportable Legal Entities \| AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.0				0.0	0.0	0.0	0.0
Other comprehensive income									0.7	0.0	0.0
Balance	0.7				0.0				0.7	0.0	0.0
Guarantor Subsidiaries \| Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				51.6					51.6
Net income									(0.5)	(0.5)	0.0
Balance	51.1				51.6				51.1	51.6
Guarantor Subsidiaries \| Reportable Legal Entities \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.1				0.1	0.1	0.1	0.1
Issuance of common stock									0.0	0.0	0.0
Balance	0.1				0.1				0.1	0.1	0.1
Guarantor Subsidiaries \| Reportable Legal Entities \| Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.0				0.0	0.0	0.0	0.0
Issuance of treasury stock									0.0	0.0	0.0
Purchase of treasury stock									0.0	0.0	0.0
Balance	0.0				0.0				0.0	0.0	0.0
Guarantor Subsidiaries \| Reportable Legal Entities \| APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				52.0				52.0	52.0	52.0	52.0
Issuance of treasury stock									0.0	0.0	0.0
Amounts related to share-based compensation									0.0	0.0	0.0
Share-based compensation expense									0.0	0.0	0.0
Balance	52.0				52.0				52.0	52.0	52.0
Guarantor Subsidiaries \| Reportable Legal Entities \| Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(0.5)				0.0	(0.5)	0.0	0.0
Net income									(0.5)	(0.5)	0.0
Balance	(1.0)				(0.5)				(1.0)	(0.5)	0.0
Guarantor Subsidiaries \| Reportable Legal Entities \| AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.0				0.0	0.0	0.0	0.0
Other comprehensive income									0.0	0.0	0.0
Balance	0.0				0.0				0.0	0.0	0.0
Non-Guarantor Subsidiaries \| Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				154.3					154.3
Net income									0.0	0.0	0.0
Balance	154.3				154.3				154.3	154.3
Non-Guarantor Subsidiaries \| Reportable Legal Entities \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.0				0.0	0.0	0.0	0.0
Issuance of common stock									0.0	0.0	0.0
Balance	0.0				0.0				0.0	0.0	0.0
Non-Guarantor Subsidiaries \| Reportable Legal Entities \| Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0.0				0.0	0.0	0.0	0.0
Issuance of treasury stock									0.0	0.0	0.0
Purchase of treasury stock									0.0	0.0	0.0
Balance	0.0				0.0				0.0	0.0	0.0
Non-Guarantor Subsidiaries \| Reportable Legal Entities \| APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				87.5				87.5	87.5	87.5	87.5
Issuance of treasury stock									0.0	0.0	0.0
Amounts related to share-based compensation									0.0	0.0	0.0
Share-based compensation expense									0.0	0.0	0.0
Balance	87.5				87.5				87.5	87.5	87.5
Non-Guarantor Subsidiaries \| Reportable Legal Entities \| Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				66.8				66.8	66.8	66.8	66.8
Net income									0.0	0.0	0.0
Balance	66.8				66.8				66.8	66.8	66.8
Non-Guarantor Subsidiaries \| Reportable Legal Entities \| AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				$ 0.0				$ 0.0	0.0	0.0	0.0
Other comprehensive income									0.0	0.0	0.0
Balance	$ 0.0				$ 0.0				$ 0.0	$ 0.0	$ 0.0