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Recent Accounting Pronouncements Schedule of Prospective Adoption of New Accounting Pronouncement (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Income from Continuing Operations before Income Taxes, Domestic	$ 32.2	$ 46.1	$ 291.6	$ 20.6	$ 337.7	$ 369.9	$ 208.9
Income Taxes	8.5	17.1	105.0	5.8	122.1	130.6	74.7
Income from Continuing Operations	23.7	29.0	186.6	14.8	215.6	239.3	134.2
Income (Loss) from Discontinued Operations - net of taxes	3.5	(0.1)	0.0	(19.7)	(0.1)	3.4	108.5
Net Income	$ 27.2	$ 28.9	$ 186.6	$ (4.9)	$ 215.5	$ 242.7	$ 242.7
Basic Earnings Per Share
Continuing operations	$ 0.07	$ 0.09	$ 0.58	$ 0.05	$ 0.67	$ 0.74	$ 0.42
Discontinued operations		0.00	0.00		0.00
Basic Earnings Per Share	0.08	0.09	0.58	(0.02)	0.67	0.76	0.72
Diluted Earnings Per Share
Continuing operations	0.07	0.09	0.58	0.05	0.67	0.74	0.42
Discontinued operations		0.00	0.00		0.00
Diluted Earnings Per Share	$ 0.08	$ 0.09	$ 0.58	$ (0.02)	$ 0.67	$ 0.75	$ 0.71
Basic Average Common Shares Outstanding	322,318	321,725	320,281	318,090	321,003	321,445	317,390
Diluted Average Common Shares	323,918	323,204	322,460	321,465	322,832	323,197	320,718
Previous Accounting Guidance
Income Statement [Abstract]
Income from Continuing Operations before Income Taxes, Domestic		$ 46.1	$ 291.6		$ 337.7
Income Taxes		17.4	111.9		129.3
Income from Continuing Operations		28.7	179.7		208.4
Income (Loss) from Discontinued Operations - net of taxes		(0.1)	0.0		(0.1)
Net Income		$ 28.6	$ 179.7		$ 208.3
Basic Earnings Per Share
Continuing operations		$ 0.09	$ 0.56		$ 0.65
Discontinued operations		0.00	0.00		0.00
Basic Earnings Per Share		0.09	0.56		0.65
Diluted Earnings Per Share
Continuing operations		0.09	0.56		0.65
Discontinued operations		0.00	0.00		0.00
Diluted Earnings Per Share		$ 0.09	$ 0.56		$ 0.65
Basic Average Common Shares Outstanding		321,725	320,281		321,003
Diluted Average Common Shares		322,894	322,021		322,457
AccountingStandardsUpdate201609
Income Statement [Abstract]
Income from Continuing Operations before Income Taxes, Domestic		$ 0.0	$ 0.0		$ 0.0
Income Taxes		(0.3)	(6.9)		(7.2)
Income from Continuing Operations		0.3	6.9		7.2
Income (Loss) from Discontinued Operations - net of taxes		0.0	0.0		0.0
Net Income		$ 0.3	$ 6.9		$ 7.2
Basic Earnings Per Share
Continuing operations		$ 0.00	$ 0.02		$ 0.02
Discontinued operations		0.00	0.00		0.00
Basic Earnings Per Share		0.00	0.02		0.02
Diluted Earnings Per Share
Continuing operations		0.00	0.02		0.02
Discontinued operations		0.00	0.00		0.00
Diluted Earnings Per Share		$ 0.00	$ 0.02		$ 0.02
Basic Average Common Shares Outstanding		0	0		0
Diluted Average Common Shares		309	450		350

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