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STOCK-BASED COMPENSATION PLANS - Narrative (FY) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 6.4 | $ 2.6 | $ 20.5 | $ 14.5 |  |  | $ 21.3 | $ 20.8 | $ 26.0
Tax benefits related to stock-based compensation plans |  |  |  |  |  |  | 8.9 | $ 14.9 | $ 15.3
Unamortized compensation expense expected to be vested | 35.4 |  | 35.4 |  |  |  | $ 24.6 |  |
Recognized weighted average period, years |  |  |  |  |  |  | 1 year 2 months 12 days |  |
Risk-free interest rate, year |  |  |  |  |  |  | 7 years |  |
Employee Stock Option |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 0.4 |  | 1.2 |  |  |  | $ 1.7 |  |
Restricted Stock |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 2.3 |  | 5.0 |  |  |  |  |  |
Non-Vested Restricted Stock |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  | 7.0 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 2.3 |  | $ 7.0 |  |  |  | $ 4.6 |  |
Incentive Stock Awards |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |  | 3 years |  |
Stock-based compensation expense | $ 1.2 |  | $ 6.4 |  |  |  | $ 6.5 |  |
Percentage of incentive stock awards expected to be vested and awarded of stocks granted |  |  |  |  |  |  | 84.00% |  |
Incentive Stock Awards | Scenario Forecast as of December 31,2017 [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Percentage of incentive stock awards expected to be vested and awarded of stocks granted |  |  |  |  | 91.00% | 77.00% |  |  |
Incentive Stock Awards | Minimum |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Percentage of incentive stock awards expected to be vested and awarded of stocks granted |  |  | 0.00% |  |  |  | 0.00% |  |
Incentive Stock Awards | Maximum |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Percentage of incentive stock awards expected to be vested and awarded of stocks granted |  |  | 200.00% |  |  |  | 200.00% |  |
Directors Plan |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  | 881,192 |  |
Stock-based compensation expense |  |  |  |  |  |  | $ 1.5 |  |
Directors Plan | Employee Stock Option |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Plan term, years |  |  |  |  |  |  | 10 years |  |
Shares authorized for grants |  |  |  |  |  |  | 1,000,000 |  |
Award vesting period |  |  |  |  |  |  | 3 years |  |
Directors Plan | Restricted Stock |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  | 1 year |  |
Shares issued |  |  |  |  |  |  | 16,500 | 16,972 | 11,256
Directors Plan | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  | 1 year |  |
2011 Plan |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  |  |  |  |  | 3,192,453 |  |
Shares authorized for grants | 3,800,000 |  | 3,800,000 |  |  |  |  |  |
2011 Plan | Employee Stock Option |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Plan term, years |  |  | 10 years |  |  |  | 10 years |  |
Award vesting period |  |  | 4 years |  |  |  | 4 years |  |
2011 Plan | Restricted Stock |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  | 4 years |  |  |  | 4 years |  |
2000 Plan | Employee Stock Option |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Plan term, years |  |  | 10 years |  |  |  | 10 years |  |
Award vesting period |  |  | 4 years |  |  |  | 4 years |  |
2000 Plan | Restricted Stock |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  | 4 years |  |  |  | 4 years |  |

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