|
Earnings Per Share (Details)
In Millions, unless otherwise specified |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Earnings Per Share [Abstract] | ||||
| Weighted-average basic common shares outstanding (in shares) | 176.2 | 175.7 | 176.0 | 175.6 |
| Potential number of shares issuable under the Company's LTSIP (in shares) | 0.3 | 0.4 | 0.3 | 0.5 |
| Weighted-average diluted common shares outstanding (in shares) | 176.5 | 176.1 | 176.3 | 176.1 |