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Income Taxes, Additional Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure
Decrease in unrecognized tax benefits reasonably possible in the next twelve months	$ 10.0
Net accrued interest and penalties, total	16.8	$ 16.2
Interest expense and penalties related to unrecognized income tax benefits	$ 0.6	$ 3.4	$ 0.7
Federal
Income Tax Disclosure
All audit periods prior to this year are closed	2012
State
Income Tax Disclosure
All audit periods prior to this year are closed	2011

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- Definition

Identification, by major jurisdiction, of tax years that are closed to examination under enacted tax laws.

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
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