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Fair Value Measurements Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Level 1
Fair value assets and liabilities measured on nonrecurring basis
Total long-term debt	$ 0.0	$ 0.0
Level 2
Fair value assets and liabilities measured on nonrecurring basis
Total long-term debt	3,738.8	3,605.6
Level 3
Fair value assets and liabilities measured on nonrecurring basis
Total long-term debt	39.2	38.0
Fair Value, Total [Member]
Fair value assets and liabilities measured on nonrecurring basis
Total long-term debt	$ 3,778.0	$ 3,643.6

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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