Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 9 Months Ended | 14 Months Ended | |||
---|---|---|---|---|---|---|
Mar. 31, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 29, 2016 |
May 14, 2015 |
|
Share Repurchases [Line Items] | ||||||
Payments for repurchase of common stock | $ 0.0 | $ 75.0 | ||||
2015 Repurchase Program | ||||||
Share Repurchases [Line Items] | ||||||
Stock repurchase program, authorized amount | $ 1,500.0 | |||||
Stock repurchased and retired (shares) | 15,765,025 | |||||
Payments for repurchase of common stock | $ 650.0 | |||||
Stock repurchase program, remaining authorized repurchase amount | $ 850.0 | |||||
2015 Repurchase Program | February 2016 ASR | ||||||
Share Repurchases [Line Items] | ||||||
Stock repurchased and retired (shares) | 2,766,558 | |||||
Payment under ASR | $ 75.0 | |||||
Final average price per share under ASR | $ 27.11 |