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Stock-Based Compensation - Unvested restricted stock and deferred shares activity (Details) - 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 | Dec. 31, 2015
Other Disclosures |  |  |  |
Total unrecognized compensation cost related to the unvested awards | $ 17.4 |  |  |
Total weighted average remaining term of unvested awards | 1 year 7 months 10 days |  |  |
Compensation cost recognized | $ 13.8 | $ 13.9 | $ 13.4 |
Performance stock units |  |  |  |
Summary of unvested restricted stock and deferred shares activity and related information |  |  |  |
Unvested at beginning of year (in shares) | 273 | 267 | 201 |
Granted (in shares) | 96 | 98 | 107 |
Cancelled/Forfeitures (in shares) | (80) | (38) | (41) |
Vested (in shares) | (40) | (54) |  |
Unvested at end of year (in shares) | 249 | 273 | 267 | 201
Weighted Average Grant Date Fair Value |  |  |  |
Unvested at beginning of period (in dollars per share) | $ 58.23 | $ 56.96 | $ 57.98 |
Granted (in dollars per share) | 81.51 | 60.45 | 55.27 |
Cancelled/Forfeitures (in dollars per share) | 58.96 | 57.12 | 57.56 |
Vested (in dollars per share) | 63.43 | 56.81 |  |
Unvested at end of period (in dollars per share) | $ 66.15 | $ 58.23 | $ 56.96 | $ 57.98
Other Disclosures |  |  |  |
Total fair value of shares vested | $ 5.8 | $ 3.5 | $ 0.0 | $ 0.0
Total unrecognized compensation cost related to the unvested awards | $ 6.6 |  |  |
Total weighted average remaining term of unvested awards | 1 year 6 months 4 days |  |  |
Compensation cost recognized | $ 5.2 | $ 4.8 | $ 4.0 |
Aggregate intrinsic value of outstanding awards | $ 16.1 |  |  |
Performance stock units | Class A |  |  |  |
Other Disclosures |  |  |  |
Company's closing Common Stock price (in dollars per share) | $ 64.53 |  |  |
Second Amended and Restated 2004 Stock Incentive Plan | Restricted stock and deferred shares |  |  |  |
Summary of unvested restricted stock and deferred shares activity and related information |  |  |  |
Unvested at beginning of year (in shares) | 217 | 210 | 244 |
Granted (in shares) | 153 | 139 | 140 |
Cancelled/Forfeitures (in shares) | (126) | (9) | (42) |
Vested (in shares) | (28) | (123) | (132) |
Unvested at end of year (in shares) | 216 | 217 | 210 | 244
Weighted Average Grant Date Fair Value |  |  |  |
Unvested at beginning of period (in dollars per share) | $ 57.31 | $ 53.79 | $ 52.61 |
Granted (in dollars per share) | 80.52 | 60.88 | 56.33 |
Cancelled/Forfeitures (in dollars per share) | 59.52 | 55.55 | 54.43 |
Vested (in dollars per share) | 66.24 | 55.35 | 53.10 |
Unvested at end of period (in dollars per share) | $ 71.28 | $ 57.31 | $ 53.79 | $ 52.61
Other Disclosures |  |  |  |
Total fair value of shares vested | $ 10.2 | $ 7.7 | $ 7.9 |
Total unrecognized compensation cost related to the unvested awards | $ 10.0 |  |  |
Total weighted average remaining term of unvested awards | 1 year 8 months 12 days |  |  |
Compensation cost recognized | $ 7.6 | $ 6.9 | $ 7.6 |
Aggregate intrinsic value of outstanding awards | $ 13.9 |  |  |
Second Amended and Restated 2004 Stock Incentive Plan | Restricted stock and deferred shares | Class A |  |  |  |
Other Disclosures |  |  |  |
Company's closing Common Stock price (in dollars per share) | $ 64.53 |  |  |
Management Stock Purchase Plan | Restricted stock | Class A |  |  |  |
Other Disclosures |  |  |  |
Company's closing Common Stock price (in dollars per share) | $ 64.53 |  |  |
Management Stock Purchase Plan | Restricted stock units (RSUs) |  |  |  |
Summary of unvested restricted stock and deferred shares activity and related information |  |  |  |
Granted (in shares) | 36 | 47 | 89 |
Cancelled/Forfeitures (in shares) | (10) | (3) | (28) |
Weighted Average Grant Date Fair Value |  |  |  |
Granted (in dollars per share) | $ 21.80 | $ 16.84 | $ 18.15 |
Other Disclosures |  |  |  |
Total unrecognized compensation cost related to the unvested awards | $ 0.8 |  |  |
Total weighted average remaining term of unvested awards | 1 year 2 months 16 days |  |  |
Compensation cost recognized | $ 1.0 | $ 1.0 | $ 0.7 |
Aggregate intrinsic value of outstanding awards | 3.0 |  |  |
Dividend declared and unpaid | $ 0.1 |  |  |

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