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STOCK-BASED COMPENSATION: Non vested time vesting restricted stock unit activity (Details) - Restricted stock units - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018
Restricted Stock Unit Activity - Other disclosures |  |  |
Share-based compensation expense | $ 34.6 | $ 21.6 |
Time Based Vesting |  |  |
Non-vested restricted stock unit activity |  |  |
Outstanding at the beginning of the period (in shares) | 2,702,497 |  |
Granted (in shares) | 1,877,874 |  |
Vested (in shares) | (1,363,871) |  |
Forfeited or cancelled (in shares) | (265,878) |  |
PSUs converted to RSUs in conjunction with AMS disposition (in shares) | 1,017,422 |  |
Outstanding at the end of the period (in shares) | 3,968,044 |  | 2,702,497
Non-vested restricted stock units, Weighted average fair value per share at grant date |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 24.60 |  |
Granted (in dollars per share) | 33.66 |  |
Vested (in dollars per share) | 24.60 |  |
Forfeited or cancelled (in dollars per share) | 25.39 |  |
PSUs converted to RSUs in conjunction with AMS disposition (in dollars per share) | 21.21 |  |
Outstanding at the end of the period (in dollars per share) | $ 27.97 |  | $ 24.60
Weighted-average remaining contractual term |  |  |
Weighted average remaining contractual term (in years) | 2 years 4 months 13 days |  | 2 years 4 months 2 days
Restricted Stock Unit Activity - Other disclosures |  |  |
Aggregate fair value of restricted stock units granted | $ 63.2 |  |
Total fair value | $ 54.4 |  |
Performance stock |  |  |
Non-vested restricted stock unit activity |  |  |
Outstanding at the beginning of the period (in shares) | 561,018 |  |
Granted (in shares) | 516,954 |  |
Additional earned performance shares (in shares) | 176 |  |
Vested (in shares) | (61,330) |  |
Forfeited or cancelled (in shares) | (129,501) |  |
PSUs converted to RSUs in conjunction with AMS disposition (in shares) | (508,711) |  |
Outstanding at the end of the period (in shares) | 378,606 |  | 561,018
Non-vested restricted stock units, Weighted average fair value per share at grant date |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 25.68 |  |
Granted (in dollars per share) | 40.82 |  |
Additional earned performance shares (in dollars per share) | 23.89 |  |
Vested (in dollars per share) | 24.22 |  |
Forfeited or cancelled (in dollars per share) | 25.15 |  |
PSUs converted to RSUs in conjunction with AMS disposition (in dollars per share) | 28.08 |  |
Outstanding at the end of the period (in dollars per share) | $ 43.55 |  | $ 25.68
Weighted-average remaining contractual term |  |  |
Weighted average remaining contractual term (in years) | 3 years 5 months 12 days |  | 2 years 6 months 10 days
Restricted Stock Unit Activity - Other disclosures |  |  |
Aggregate fair value of restricted stock units granted | $ 21.1 |  |
Performance Shares Vesting Total Shareholder Return |  |  |
Non-vested restricted stock unit activity |  |  |
Granted (in shares) | 186,539 |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Aggregate fair value of restricted stock units granted | $ 5.8 |  |
Performance Shares Vesting Under The Second Plan |  |  |
Non-vested restricted stock unit activity |  |  |
Granted (in shares) | 330,415 |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Aggregate fair value of restricted stock units granted | $ 15.3 |  |
Share-based Compensation Award, Tranche One |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Future share-based compensation expense expected | 12.5 |  |
Share-based Compensation Award, Tranche Two |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Future share-based compensation expense expected | 42.5 |  |
Share-based Compensation Award, Tranche Three |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Future share-based compensation expense expected | 27.9 |  |
Share-based Compensation Award, Tranche Four |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Future share-based compensation expense expected | 15.6 |  |
Share-based Compensation Award, Tranche Five |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Future share-based compensation expense expected | $ 4.2 |  |
Vesting in four years |  |  |
Non-vested restricted stock unit activity |  |  |
Granted (in shares) | 197,115 |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting period | 4 years |  |
Partial cliff vest tranche one |  |  |
Non-vested restricted stock unit activity |  |  |
Granted (in shares) | 1,272,337 |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 25.00% |  |
Partial cliff vesting tranche two |  |  |
Non-vested restricted stock unit activity |  |  |
Granted (in shares) | 330,415 |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 50.00% |  |
Vesting in three years |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 75.00% |  |
Vesting period | 3 years |  |
Vesting in two years |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 50.00% |  |
Vesting period | 2 years |  |
Vesting in one year |  |  |
Non-vested restricted stock unit activity |  |  |
Granted (in shares) | 78,007 |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting period | 1 year |  |
Minimum | Performance Shares Vesting Total Shareholder Return |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 25.00% |  |
Minimum | Performance Shares Vesting Under The Second Plan |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 0.00% |  |
Maximum | Performance Shares Vesting Total Shareholder Return |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 200.00% |  |
Maximum | Performance Shares Vesting Under The Second Plan |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 200.00% |  |

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