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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
RSU activity and related information |  |  |
Outstanding at beginning of period (in shares) | 148 | 101 | 80
Granted (in shares) | 47 | 89 | 60
Cancelled/Forfeitures (in shares) | (3) | (28) | (9)
Settled (in shares) | (18) | (14) | (30)
Outstanding at end of period (in shares) | 174 | 148 | 101
Vested at end of period (in shares) | 57 | 28 | 25
Weighted Average Purchase Price |  |  |
Outstanding at beginning of period (in dollars per share) | $ 36.37 | $ 36.14 | $ 32.08
Granted (in dollars per share) | 49.92 | 35.41 | 37.13
Cancelled/Forfeitures (in dollars per share) | 41.55 | 32.25 | 36.92
Settled (in dollars per share) | 39.09 | 36.91 | 27.10
Outstanding at end of period (in dollars per share) | 39.68 | 36.37 | 36.14
Vested at end of period (in dollars per share) | 36.26 | $ 37.78 | $ 33.35
Weighted Average Intrinsic Value |  |  |
Outstanding at end of period (in dollars per share) | 36.27 |  |
Vested at end of period (in dollars per share) | $ 39.69 |  |
Aggregate intrinsic value of outstanding awards | $ 6.3 |  |
Aggregate intrinsic vlaue of awards vested | 2.3 |  |
Total intrinsic value of awards settled | $ 0.4 | $ 1.5 | $ 0.8

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