Business and Summary of Significant Accounting Principles (Interest Expense) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Accounting Policies [Abstract] | |||
| Interest costs capitalized | $ 5.7 | $ 3.7 | $ 3.0 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of interest capitalized during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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