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Stock-Based Compensation - RSU activity (Details) - Management Stock Purchase Plan - Restricted stock units (RSUs) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
RSU activity and related information |  |  |
Outstanding at beginning of period (in shares) | 174 | 148 | 101
Granted (in shares) | 36 | 47 | 89
Cancelled/Forfeitures (in shares) | (10) | (3) | (28)
Settled (in shares) | (46) | (18) | (14)
Outstanding at end of period (in shares) | 154 | 174 | 148
Vested at end of period (in shares) | 66 | 57 | 28
Weighted Average Purchase Price |  |  |
Outstanding at beginning of period (in dollars per share) | $ 39.68 | $ 36.37 | $ 36.14
Granted (in dollars per share) | 61.84 | 49.92 | 35.41
Cancelled/Forfeitures (in dollars per share) | 48.82 | 41.55 | 32.25
Settled (in dollars per share) | 37.34 | 39.09 | 36.91
Outstanding at end of period (in dollars per share) | 45.02 | 39.68 | 36.37
Vested at end of period (in dollars per share) | 38.17 | $ 36.26 | $ 37.78
Weighted Average Intrinsic Value |  |  |
Outstanding at end of period (in dollars per share) | 19.51 |  |
Vested at end of period (in dollars per share) | $ 26.36 |  |
Aggregate intrinsic value of outstanding awards | $ 3.0 |  |
Aggregate intrinsic value of awards vested | 1.7 |  |
Total intrinsic value of awards settled | $ 1.8 | $ 0.4 | $ 1.5

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