Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

+ References

No definition available.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Significant Accounting Policies (Details) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
Significant Accounting Policies (Details) $ in Millions	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	May 10, 2013 USD ($)
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 15.0			$ 15.0
Number of Operating Segments				1
Line Of Credit Up To $280,000 Due 2018 [Member]
Maximum borrowing capacity							$ 280.0
ASU 2016-09 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 0.2			$ 0.7	$ 0.3
ASU 2015-17 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			$ 20.4			$ 7.7
ASU 2015-03 and ASU 2015-15 [Member] \| 5.75% senior unsecured notes due 2018
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ (2.0)	(3.1)			(2.6)
ASU 2015-03 and ASU 2015-15 [Member] \| Line Of Credit Up To $280,000 Due 2018 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 1.1	$ 1.4			$ 1.4