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Fair Value Measurements - Fair Value of Debt Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair Value | Level 2
Fair Value of Financial Instruments [Abstract]
Debt	$ 2,260.9	$ 2,275.5
Carrying Value
Fair Value of Financial Instruments [Abstract]
Debt	$ 2,174.3	$ 2,215.3

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611

+ Details

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- References

No definition available.

+ Details

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