Capital Contributions and Dividends (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		0 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	May 02, 2014	May 20, 2014 Lion	Jun. 30, 2013 Lion
Dividends Payable [Line Items]
Capital contribution from parent	$ 0	$ 0
Capital contributions to parent	281.0	174.0		281.0	174.0
Dividends payable			$ 281.0

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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

-Publisher FASB

-Name Accounting Standards Codification

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph a

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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+ References

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

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-Name Accounting Standards Codification

-Glossary Financing Activities

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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