Income Taxes (Schedule Of Percentage Of Pretax Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase (decrease) due to:
Effective Tax Rate — Continuing operations	$ 27.7	$ (119.8)	$ (31.9)	$ 56.2	$ (6.6)	$ 54.5	$ 111.2	$ 44.4	$ (67.8)	$ 203.5	$ (538.0)
Total Effective Tax Rate									$ 38.6	$ 1,014.4	$ (498.8)
Total Effective Tax Rate									7.60%	609.70%	(93.20%)
Continuing Operations
Effective Income Tax Rate Reconciliation [Line Items]
Pretax Income									$ 191.6	$ 20.9	$ 186.0
Income tax expense (benefit)
Federal income tax rate									$ 67.0	$ 7.3	$ 65.1
Federal income tax rate									35.00%	35.00%	35.00%
Increase (decrease) due to:
State and local income taxes, net of federal income tax benefit									$ 4.4	$ 21.0	$ (10.8)
State and local income taxes, net of federal income tax benefit									2.30%	101.00%	(5.90%)
Non-deductible goodwill									$ 58.7	$ 126.2	$ 8.3
Non-deductible goodwill									30.70%	606.60%	4.50%
Domestic tax credits									$ (20.7)	$ (18.1)	$ (7.5)
Domestic tax credits									(10.80%)	(87.00%)	(4.00%)
Cumulative Method Change — Tax Advantaged Investments									$ 26.6	$ 0.0	$ 0.0
Cumulative Method Change — Tax Advantaged Investments									13.90%	(0.00%)	(0.00%)
Effect of tax law changes									$ (22.6)	$ 0.0	$ 0.0
Effect of tax law changes									(11.80%)	0.00%	0.00%
Lower tax rates applicable to non-U.S. earnings									$ (1.6)	$ (10.3)	$ 0.6
Lower tax rates applicable to non-U.S. earnings									(0.80%)	(49.60%)	0.30%
International income subject to U.S. tax									$ 1.2	$ 29.2	$ 42.1
International income subject to U.S. tax									0.60%	140.30%	22.60%
Unrecognized tax expense (benefit)									$ (0.2)	$ (14.4)	$ 4.5
Unrecognized tax expense (benefit)									(0.10%)	(69.30%)	2.40%
Deferred income taxes on international unremitted earnings									$ 4.6	$ 41.8	$ 30.2
Deferred income taxes on international unremitted earnings									2.40%	200.70%	16.20%
International Restructuring									$ (237.9)	$ 0.0	$ 0.0
International Restructuring									(124.20%)	0.00%	0.00%
Valuation allowances									$ 60.5	$ 14.7	$ (693.8)
Valuation allowances									31.60%	70.60%	(373.00%)
International tax settlements									$ (3.5)	$ (0.6)	$ (3.5)
International tax settlements									(1.80%)	(2.70%)	(1.90%)
Other									$ (4.3)	$ 6.7	$ 26.8
Other									(2.40%)	32.40%	14.60%
Effective Tax Rate — Continuing operations									$ (67.8)	$ 203.5	$ (538.0)
Effective Tax Rate — Continuing operations									(35.40%)	978.00%	(289.20%)
Discontinued Operation
Effective Income Tax Rate Reconciliation [Line Items]
Pretax Income									$ 315.2	$ 145.5	$ 349.2
Income tax expense (benefit)
Federal income tax rate									$ 110.3	$ 50.9	$ 122.2
Federal income tax rate									35.00%	35.00%	35.00%
Increase (decrease) due to:
State and local income taxes, net of federal income tax benefit									$ 7.2	$ (9.5)	$ 0.6
State and local income taxes, net of federal income tax benefit									2.30%	(6.50%)	0.20%
Non-deductible penalties									$ 0.0	$ 16.6	$ 0.0
Non-deductible penalties									0.00%	11.40%	0.00%
Lower tax rates applicable to non-U.S. earnings									$ (93.2)	$ (110.8)	$ (89.3)
Lower tax rates applicable to non-U.S. earnings									(29.60%)	(76.10%)	(25.60%)
International income subject to U.S. tax									$ 44.2	$ 16.7	$ 8.1
International income subject to U.S. tax									14.00%	11.50%	2.30%
Deferred income taxes on international unremitted earnings									$ 39.7	$ 847.3	$ 0.0
Deferred income taxes on international unremitted earnings									12.60%	582.10%	0.00%
Other									$ (1.8)	$ (0.3)	$ (2.4)
Other									(0.50%)	(0.30%)	(0.70%)
Effective Tax Rate — Discontinued operation									$ 106.4	$ 810.9	$ 39.2
Effective Tax Rate — Discontinued operation									33.80%	557.10%	11.20%