Subsequent Events Narrative (Details) - USD ($) $ in Millions |
Nov. 02, 2017 |
Sep. 30, 2017 |
---|---|---|
Subsequent Event [Line Items] | ||
Stock Repurchase Program, Authorized Amount | $ 410.0 | |
Subsequent Event | ||
Subsequent Event [Line Items] | ||
Stock Repurchase Program, Authorized Amount | $ 610.0 | |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 301.4 |