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Employee Benefits Fair Value of Pension Plan Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Fair Value of Pension Plan Assets [Table Text Block] | The following table presents the fair value of our domestic and foreign pension plan assets as of December 31, 2017 and 2016, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value. See Note 10 for a description of the fair value hierarchy.
| December 31, 2017 |  | December 31, 2016
Plan assets subject to fair value hierarchy | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Registered investment companies | $ | 14.7 |  |  | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 14.7 |  |  | $ | 14.4 |  |  | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 14.4 |
Limited partnerships | 0.0 |  |  | 0.0 |  |  | 29.5 |  |  | 29.5 |  |  | 0.0 |  |  | 0.0 |  |  | 28.0 |  |  | 28.0 |
Fixed income securities | 23.4 |  |  | 0.0 |  |  | 0.0 |  |  | 23.4 |  |  | 22.6 |  |  | 0.3 |  |  | 0.0 |  |  | 22.9 |
Insurance contracts | 0.0 |  |  | 7.9 |  |  | 0.0 |  |  | 7.9 |  |  | 0.0 |  |  | 7.8 |  |  | 0.0 |  |  | 7.8 |
Other | 27.7 |  |  | 0.0 |  |  | 0.0 |  |  | 27.7 |  |  | 20.1 |  |  | 0.0 |  |  | 0.0 |  |  | 20.1 |
Total plan assets, subject to leveling | $ | 65.8 |  |  | $ | 7.9 |  |  | $ | 29.5 |  |  | $ | 103.2 |  |  | $ | 57.1 |  |  | $ | 8.1 |  |  | $ | 28.0 |  |  | $ | 93.2 |
Plan assets measured at net asset value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other investments measured at net asset value 1 |  |  |  |  |  |  | 399.8 |  |  |  |  |  |  |  |  | 367.9 |
Total plan assets |  |  |  |  |  |  | $ | 503.0 |  |  |  |  |  |  |  |  | $ | 461.1 |
1 | Certain investments that are measured at fair value using the net asset value per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy but are included to reconcile to the amounts presented in the fair value of plan assets table above.

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