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Stock-based Compensation and Other Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] | A summary of the status of the Company’s unvested RSUs as of December 31, 2019 and changes during the year then ended are presented below (number of units in millions, except fair value per unit):
|  | Service Conditions RSUs |  | Performance and Service Conditions RSUs |  | Total RSUs |  | Weighted Average Grant-Date Fair Value Per Unit
Unvested RSUs outstanding at December 31, 2018 |  | 0.4 |  |  | 0.9 |  |  | 1.3 |  |  |  | $ | 60.87 |  |
Granted |  | 0.2 |  |  | 0.4 |  |  | 0.6 |  |  |  | $ | 62.26 |  |
Vested |  | (0.1 | ) |  | (0.5 | ) |  | (0.6 | ) |  |  | $ | 56.58 |  |
Forfeited |  | — |  |  | (0.1 | ) |  | (0.1 | ) |  |  | $ | 67.58 |  |
Unvested RSUs outstanding at December 31, 2019 |  | 0.5 |  |  | 0.7 |  |  | 1.2 |  |  |  | $ | 63.21 |  |
Unvested and expected to vest RSUs outstanding at December 31, 2019 |  | 0.4 |  |  | 0.7 |  |  | 1.1 |  |  |  | $ | 62.96 |  |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | The table below presents the average Black-Scholes valuation per share of shares purchased and the compensation expense under the ESPP (in millions, except per share amounts):
Year Ended December 31, |  | Average Black-Scholes Valuation per Share |  | Shares |  | Expense
2019 |  | $17.11 |  | 0.2 |  | $ | 4.1 |
2018 |  | $15.09 |  | 0.2 |  | $ | 2.7 |
2017 |  | $9.71 |  | 0.2 |  | $ | 2.1 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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