Credit Facilities (Details) $ in Millions |
3 Months Ended |
|---|---|
|
Mar. 31, 2017
USD ($)
| |
| Line of Credit Facility [Abstract] | |
| Line of Credit Facility, Expiration Date | Oct. 20, 2020 |
| Line of Credit Facility, Maximum Borrowing Capacity | $ 1,000.0 |
| Line of Credit Facility, Available Capacity Increase Amount | 250.0 |
| Line of Credit Facility, Limit on Letters of Credit | $ 200.0 |