|
Fair Value Disclosures (Available-For-Sale Debt Securities) (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | 12 Months Ended |
|---|---|---|
|
Jun. 30, 2013
|
Dec. 31, 2012
|
|
| Fair Value Disclosure [Line Items] | ||
| Amortized Cost | $ 109.7 | $ 107.9 |
| Gross Unrealized Gains | 1.3 | 4.0 |
| Gross Unrealized Losses | (2.4) | (0.1) |
| Fair Value | 108.6 | 111.8 |
|
Government [Member]
|
||
| Fair Value Disclosure [Line Items] | ||
| Amortized Cost | 27.5 | 31.1 |
| Gross Unrealized Gains | 0.4 | 1.5 |
| Gross Unrealized Losses | (0.8) | 0 |
| Fair Value | 27.1 | 32.6 |
|
Corporate/Other Bonds [Member]
|
||
| Fair Value Disclosure [Line Items] | ||
| Amortized Cost | 82.2 | 76.8 |
| Gross Unrealized Gains | 0.9 | 2.5 |
| Gross Unrealized Losses | (1.6) | (0.1) |
| Fair Value | $ 81.5 | $ 79.2 |