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Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Securities Repurchase Program |  |  |  |
Repurchase of common stock | $ 76.2 | $ 5.8 | $ 130.6 | $ 55.8
Securities Repurchase Program |  |  |  |
Securities Repurchase Program |  |  |  |
Repurchased shares | 1,591,917 |  | 2,850,265 |
Repurchase of common stock | $ 71.3 |  | $ 125.7 |
Repurchased shares, average price (in dollars per share) | $ 44.79 |  | $ 44.08 |
Remaining amount authorized to be repurchased | $ 74.4 |  | $ 74.4 |
Acquired Employee Equity Awards |  |  |  |
Securities Repurchase Program |  |  |  |
Repurchased shares | 114,949 |  |  |
Repurchase of common stock | $ 4.9 |  |  |
Repurchased shares, average price (in dollars per share) | $ 42.72 |  |  |
Roger S. Penske | Securities Repurchase Program |  |  |  |
Securities Repurchase Program |  |  |  |
Repurchased shares | 256,369 |  |  |
Repurchase of common stock | $ 11.4 |  |  |
Repurchased shares, average price (in dollars per share) | $ 44.40 |  |  |

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