Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Oct. 14, 2016 |
Aug. 31, 2016 |
Aug. 30, 2016 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Feb. 25, 2016 |
|
| Common stock dividends paid | $ 156.7 | $ 147.3 | ||||||
| Dividends declared per common share (in dollars per share) | $ 2.52 | $ 2.20 | $ 0.63 | $ 0.55 | $ 1.73 | $ 1.65 | ||
| Stock repurchase program, authorized amount | $ 200.0 | |||||||
| Repurchases of common stock | $ 100.3 | $ 98.1 | ||||||
| Shares of common stock repurchased | 1,987,187 | |||||||
| Subsequent Event | ||||||||
| Common stock dividends paid | $ 59.4 | |||||||
| Dividends paid per common share (in dollars per share) | $ 0.63 | |||||||