Income Tax Uncertainties (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2014	Dec. 31, 2013
Income Tax Uncertainties
Unrecognized tax benefits, including penalties and interest that if recognized would impact effective tax rate	$ 13.1	$ 12.0
Unrecognized tax benefits, including penalties and interest, net of federal tax benefit that if recognized would affect effective tax rate	9.1	8.4
Accrued interest and penalties related to uncertain tax positions	3.4	3.0
Accrued interest and penalties related to uncertain tax positions, net of federal benefit	2.8	2.5
Total expense of interest and penalties, net of federal benefit related to uncertain tax positions	$ 0.3

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

+ Details

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- Definition

Represents the total of accruals, net of federal tax benefits as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return that does not meet the minimum statutory threshold to avoid payment of penalties.

+ References

No definition available.

+ Details

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- Definition

Represents the total of interest expense, net of federal benefit, recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return that does not meet the minimum statutory threshold to avoid payment of penalties.

+ References

No definition available.

+ Details

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- Definition

The total amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate, including accrued penalties and interest.

+ References

No definition available.

+ Details

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- Definition

The total amount of unrecognized tax benefits net of federal tax benefits that, if recognized, would affect the effective tax rate, including accrued penalties and interest.

+ References

No definition available.

+ Details

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