|
Fair Values of Financial Instruments (Details 2) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions | ||
| Total Carrying Value | $ 1,136.4 | $ 1,137.6 |
| Total borrowings | 1,139.0 | 1,140.4 |
| Fair Value, Inputs, Level 2 [Member] | ||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions | ||
| Estimated Fair Value | $ 1,134.5 | $ 1,102.0 |