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Retirement Plans - Defined Contribution Plans (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Retirement Benefits [Abstract] |  |  |  |  |
Maximum percentage of employee compensation match by employer to employee stock ownership plan (percent) |  |  | 4.00% |  |
Employer contributions | $ 3.3 | $ 3.0 | $ 11.5 | $ 10.2 |
Maximum percent of employer matching contribution in form of stock (percent) |  |  | 50.00% |  |
Shares held in defined contribution plan (shares) | 1.2 |  | 1.2 |  | 1.2

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- Definition Defined Contribution Plan, Amount Held in Common Shares + References No definition available. + Details
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- Definition Defined Contribution Plan, Employer Matching Contribution, Maximum Percent of Match in Stock + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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