|
Fair Value (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2015
|
|---|---|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |
| Senior notes | $ 1,330.2 |
| Estimate of Fair Value Measurement [Member] | |
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |
| Senior notes | $ 1,345.4 |